Current File : //proc/self/root/proc/self/root/opt/alt/python37/lib64/python3.7/site-packages/numpy/ma/core.py
"""
numpy.ma : a package to handle missing or invalid values.
This package was initially written for numarray by Paul F. Dubois
at Lawrence Livermore National Laboratory.
In 2006, the package was completely rewritten by Pierre Gerard-Marchant
(University of Georgia) to make the MaskedArray class a subclass of ndarray,
and to improve support of structured arrays.
Copyright 1999, 2000, 2001 Regents of the University of California.
Released for unlimited redistribution.
* Adapted for numpy_core 2005 by Travis Oliphant and (mainly) Paul Dubois.
* Subclassing of the base `ndarray` 2006 by Pierre Gerard-Marchant
(pgmdevlist_AT_gmail_DOT_com)
* Improvements suggested by Reggie Dugard (reggie_AT_merfinllc_DOT_com)
.. moduleauthor:: Pierre Gerard-Marchant
"""
# pylint: disable-msg=E1002
from __future__ import division, absolute_import, print_function
import sys
import operator
import warnings
from functools import reduce
if sys.version_info[0] >= 3:
import builtins
else:
import __builtin__ as builtins
import numpy as np
import numpy.core.umath as umath
import numpy.core.numerictypes as ntypes
from numpy import ndarray, amax, amin, iscomplexobj, bool_, _NoValue
from numpy import array as narray
from numpy.lib.function_base import angle
from numpy.compat import (
getargspec, formatargspec, long, basestring, unicode, bytes
)
from numpy import expand_dims as n_expand_dims
from numpy.core.multiarray import normalize_axis_index
from numpy.core.numeric import normalize_axis_tuple
if sys.version_info[0] >= 3:
import pickle
else:
import cPickle as pickle
__all__ = [
'MAError', 'MaskError', 'MaskType', 'MaskedArray', 'abs', 'absolute',
'add', 'all', 'allclose', 'allequal', 'alltrue', 'amax', 'amin',
'angle', 'anom', 'anomalies', 'any', 'append', 'arange', 'arccos',
'arccosh', 'arcsin', 'arcsinh', 'arctan', 'arctan2', 'arctanh',
'argmax', 'argmin', 'argsort', 'around', 'array', 'asanyarray',
'asarray', 'bitwise_and', 'bitwise_or', 'bitwise_xor', 'bool_', 'ceil',
'choose', 'clip', 'common_fill_value', 'compress', 'compressed',
'concatenate', 'conjugate', 'convolve', 'copy', 'correlate', 'cos', 'cosh',
'count', 'cumprod', 'cumsum', 'default_fill_value', 'diag', 'diagonal',
'diff', 'divide', 'dump', 'dumps', 'empty', 'empty_like', 'equal', 'exp',
'expand_dims', 'fabs', 'filled', 'fix_invalid', 'flatten_mask',
'flatten_structured_array', 'floor', 'floor_divide', 'fmod',
'frombuffer', 'fromflex', 'fromfunction', 'getdata', 'getmask',
'getmaskarray', 'greater', 'greater_equal', 'harden_mask', 'hypot',
'identity', 'ids', 'indices', 'inner', 'innerproduct', 'isMA',
'isMaskedArray', 'is_mask', 'is_masked', 'isarray', 'left_shift',
'less', 'less_equal', 'load', 'loads', 'log', 'log10', 'log2',
'logical_and', 'logical_not', 'logical_or', 'logical_xor', 'make_mask',
'make_mask_descr', 'make_mask_none', 'mask_or', 'masked',
'masked_array', 'masked_equal', 'masked_greater',
'masked_greater_equal', 'masked_inside', 'masked_invalid',
'masked_less', 'masked_less_equal', 'masked_not_equal',
'masked_object', 'masked_outside', 'masked_print_option',
'masked_singleton', 'masked_values', 'masked_where', 'max', 'maximum',
'maximum_fill_value', 'mean', 'min', 'minimum', 'minimum_fill_value',
'mod', 'multiply', 'mvoid', 'ndim', 'negative', 'nomask', 'nonzero',
'not_equal', 'ones', 'outer', 'outerproduct', 'power', 'prod',
'product', 'ptp', 'put', 'putmask', 'rank', 'ravel', 'remainder',
'repeat', 'reshape', 'resize', 'right_shift', 'round', 'round_',
'set_fill_value', 'shape', 'sin', 'sinh', 'size', 'soften_mask',
'sometrue', 'sort', 'sqrt', 'squeeze', 'std', 'subtract', 'sum',
'swapaxes', 'take', 'tan', 'tanh', 'trace', 'transpose', 'true_divide',
'var', 'where', 'zeros',
]
MaskType = np.bool_
nomask = MaskType(0)
class MaskedArrayFutureWarning(FutureWarning):
pass
def _deprecate_argsort_axis(arr):
"""
Adjust the axis passed to argsort, warning if necessary
Parameters
----------
arr
The array which argsort was called on
np.ma.argsort has a long-term bug where the default of the axis argument
is wrong (gh-8701), which now must be kept for backwards compatibiity.
Thankfully, this only makes a difference when arrays are 2- or more-
dimensional, so we only need a warning then.
"""
if arr.ndim <= 1:
# no warning needed - but switch to -1 anyway, to avoid surprising
# subclasses, which are more likely to implement scalar axes.
return -1
else:
# 2017-04-11, Numpy 1.13.0, gh-8701: warn on axis default
warnings.warn(
"In the future the default for argsort will be axis=-1, not the "
"current None, to match its documentation and np.argsort. "
"Explicitly pass -1 or None to silence this warning.",
MaskedArrayFutureWarning, stacklevel=3)
return None
def doc_note(initialdoc, note):
"""
Adds a Notes section to an existing docstring.
"""
if initialdoc is None:
return
if note is None:
return initialdoc
newdoc = """
%s
Notes
-----
%s
"""
return newdoc % (initialdoc, note)
def get_object_signature(obj):
"""
Get the signature from obj
"""
try:
sig = formatargspec(*getargspec(obj))
except TypeError:
sig = ''
return sig
###############################################################################
# Exceptions #
###############################################################################
class MAError(Exception):
"""
Class for masked array related errors.
"""
pass
class MaskError(MAError):
"""
Class for mask related errors.
"""
pass
###############################################################################
# Filling options #
###############################################################################
# b: boolean - c: complex - f: floats - i: integer - O: object - S: string
default_filler = {'b': True,
'c': 1.e20 + 0.0j,
'f': 1.e20,
'i': 999999,
'O': '?',
'S': b'N/A',
'u': 999999,
'V': '???',
'U': u'N/A'
}
# Add datetime64 and timedelta64 types
for v in ["Y", "M", "W", "D", "h", "m", "s", "ms", "us", "ns", "ps",
"fs", "as"]:
default_filler["M8[" + v + "]"] = np.datetime64("NaT", v)
default_filler["m8[" + v + "]"] = np.timedelta64("NaT", v)
max_filler = ntypes._minvals
max_filler.update([(k, -np.inf) for k in [np.float32, np.float64]])
min_filler = ntypes._maxvals
min_filler.update([(k, +np.inf) for k in [np.float32, np.float64]])
if 'float128' in ntypes.typeDict:
max_filler.update([(np.float128, -np.inf)])
min_filler.update([(np.float128, +np.inf)])
def default_fill_value(obj):
"""
Return the default fill value for the argument object.
The default filling value depends on the datatype of the input
array or the type of the input scalar:
======== ========
datatype default
======== ========
bool True
int 999999
float 1.e20
complex 1.e20+0j
object '?'
string 'N/A'
======== ========
Parameters
----------
obj : ndarray, dtype or scalar
The array data-type or scalar for which the default fill value
is returned.
Returns
-------
fill_value : scalar
The default fill value.
Examples
--------
>>> np.ma.default_fill_value(1)
999999
>>> np.ma.default_fill_value(np.array([1.1, 2., np.pi]))
1e+20
>>> np.ma.default_fill_value(np.dtype(complex))
(1e+20+0j)
"""
if hasattr(obj, 'dtype'):
defval = _check_fill_value(None, obj.dtype)
elif isinstance(obj, np.dtype):
if obj.subdtype:
defval = default_filler.get(obj.subdtype[0].kind, '?')
elif obj.kind in 'Mm':
defval = default_filler.get(obj.str[1:], '?')
else:
defval = default_filler.get(obj.kind, '?')
elif isinstance(obj, float):
defval = default_filler['f']
elif isinstance(obj, int) or isinstance(obj, long):
defval = default_filler['i']
elif isinstance(obj, bytes):
defval = default_filler['S']
elif isinstance(obj, unicode):
defval = default_filler['U']
elif isinstance(obj, complex):
defval = default_filler['c']
else:
defval = default_filler['O']
return defval
def _recursive_extremum_fill_value(ndtype, extremum):
names = ndtype.names
if names:
deflist = []
for name in names:
fval = _recursive_extremum_fill_value(ndtype[name], extremum)
deflist.append(fval)
return tuple(deflist)
return extremum[ndtype]
def minimum_fill_value(obj):
"""
Return the maximum value that can be represented by the dtype of an object.
This function is useful for calculating a fill value suitable for
taking the minimum of an array with a given dtype.
Parameters
----------
obj : ndarray or dtype
An object that can be queried for it's numeric type.
Returns
-------
val : scalar
The maximum representable value.
Raises
------
TypeError
If `obj` isn't a suitable numeric type.
See Also
--------
maximum_fill_value : The inverse function.
set_fill_value : Set the filling value of a masked array.
MaskedArray.fill_value : Return current fill value.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.int8()
>>> ma.minimum_fill_value(a)
127
>>> a = np.int32()
>>> ma.minimum_fill_value(a)
2147483647
An array of numeric data can also be passed.
>>> a = np.array([1, 2, 3], dtype=np.int8)
>>> ma.minimum_fill_value(a)
127
>>> a = np.array([1, 2, 3], dtype=np.float32)
>>> ma.minimum_fill_value(a)
inf
"""
errmsg = "Unsuitable type for calculating minimum."
if hasattr(obj, 'dtype'):
return _recursive_extremum_fill_value(obj.dtype, min_filler)
elif isinstance(obj, float):
return min_filler[ntypes.typeDict['float_']]
elif isinstance(obj, int):
return min_filler[ntypes.typeDict['int_']]
elif isinstance(obj, long):
return min_filler[ntypes.typeDict['uint']]
elif isinstance(obj, np.dtype):
return min_filler[obj]
else:
raise TypeError(errmsg)
def maximum_fill_value(obj):
"""
Return the minimum value that can be represented by the dtype of an object.
This function is useful for calculating a fill value suitable for
taking the maximum of an array with a given dtype.
Parameters
----------
obj : {ndarray, dtype}
An object that can be queried for it's numeric type.
Returns
-------
val : scalar
The minimum representable value.
Raises
------
TypeError
If `obj` isn't a suitable numeric type.
See Also
--------
minimum_fill_value : The inverse function.
set_fill_value : Set the filling value of a masked array.
MaskedArray.fill_value : Return current fill value.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.int8()
>>> ma.maximum_fill_value(a)
-128
>>> a = np.int32()
>>> ma.maximum_fill_value(a)
-2147483648
An array of numeric data can also be passed.
>>> a = np.array([1, 2, 3], dtype=np.int8)
>>> ma.maximum_fill_value(a)
-128
>>> a = np.array([1, 2, 3], dtype=np.float32)
>>> ma.maximum_fill_value(a)
-inf
"""
errmsg = "Unsuitable type for calculating maximum."
if hasattr(obj, 'dtype'):
return _recursive_extremum_fill_value(obj.dtype, max_filler)
elif isinstance(obj, float):
return max_filler[ntypes.typeDict['float_']]
elif isinstance(obj, int):
return max_filler[ntypes.typeDict['int_']]
elif isinstance(obj, long):
return max_filler[ntypes.typeDict['uint']]
elif isinstance(obj, np.dtype):
return max_filler[obj]
else:
raise TypeError(errmsg)
def _recursive_set_default_fill_value(dt):
"""
Create the default fill value for a structured dtype.
Parameters
----------
dt: dtype
The structured dtype for which to create the fill value.
Returns
-------
val: tuple
A tuple of values corresponding to the default structured fill value.
"""
deflist = []
for name in dt.names:
currenttype = dt[name]
if currenttype.subdtype:
currenttype = currenttype.subdtype[0]
if currenttype.names:
deflist.append(
tuple(_recursive_set_default_fill_value(currenttype)))
else:
deflist.append(default_fill_value(currenttype))
return tuple(deflist)
def _recursive_set_fill_value(fillvalue, dt):
"""
Create a fill value for a structured dtype.
Parameters
----------
fillvalue: scalar or array_like
Scalar or array representing the fill value. If it is of shorter
length than the number of fields in dt, it will be resized.
dt: dtype
The structured dtype for which to create the fill value.
Returns
-------
val: tuple
A tuple of values corresponding to the structured fill value.
"""
fillvalue = np.resize(fillvalue, len(dt.names))
output_value = []
for (fval, name) in zip(fillvalue, dt.names):
cdtype = dt[name]
if cdtype.subdtype:
cdtype = cdtype.subdtype[0]
if cdtype.names:
output_value.append(tuple(_recursive_set_fill_value(fval, cdtype)))
else:
output_value.append(np.array(fval, dtype=cdtype).item())
return tuple(output_value)
def _check_fill_value(fill_value, ndtype):
"""
Private function validating the given `fill_value` for the given dtype.
If fill_value is None, it is set to the default corresponding to the dtype
if this latter is standard (no fields). If the datatype is flexible (named
fields), fill_value is set to a tuple whose elements are the default fill
values corresponding to each field.
If fill_value is not None, its value is forced to the given dtype.
"""
ndtype = np.dtype(ndtype)
fields = ndtype.fields
if fill_value is None:
if fields:
fill_value = np.array(_recursive_set_default_fill_value(ndtype),
dtype=ndtype)
else:
fill_value = default_fill_value(ndtype)
elif fields:
fdtype = [(_[0], _[1]) for _ in ndtype.descr]
if isinstance(fill_value, (ndarray, np.void)):
try:
fill_value = np.array(fill_value, copy=False, dtype=fdtype)
except ValueError:
err_msg = "Unable to transform %s to dtype %s"
raise ValueError(err_msg % (fill_value, fdtype))
else:
fill_value = np.asarray(fill_value, dtype=object)
fill_value = np.array(_recursive_set_fill_value(fill_value, ndtype),
dtype=ndtype)
else:
if isinstance(fill_value, basestring) and (ndtype.char not in 'OSVU'):
err_msg = "Cannot set fill value of string with array of dtype %s"
raise TypeError(err_msg % ndtype)
else:
# In case we want to convert 1e20 to int.
try:
fill_value = np.array(fill_value, copy=False, dtype=ndtype)
except OverflowError:
# Raise TypeError instead of OverflowError. OverflowError
# is seldom used, and the real problem here is that the
# passed fill_value is not compatible with the ndtype.
err_msg = "Fill value %s overflows dtype %s"
raise TypeError(err_msg % (fill_value, ndtype))
return np.array(fill_value)
def set_fill_value(a, fill_value):
"""
Set the filling value of a, if a is a masked array.
This function changes the fill value of the masked array `a` in place.
If `a` is not a masked array, the function returns silently, without
doing anything.
Parameters
----------
a : array_like
Input array.
fill_value : dtype
Filling value. A consistency test is performed to make sure
the value is compatible with the dtype of `a`.
Returns
-------
None
Nothing returned by this function.
See Also
--------
maximum_fill_value : Return the default fill value for a dtype.
MaskedArray.fill_value : Return current fill value.
MaskedArray.set_fill_value : Equivalent method.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.arange(5)
>>> a
array([0, 1, 2, 3, 4])
>>> a = ma.masked_where(a < 3, a)
>>> a
masked_array(data = [-- -- -- 3 4],
mask = [ True True True False False],
fill_value=999999)
>>> ma.set_fill_value(a, -999)
>>> a
masked_array(data = [-- -- -- 3 4],
mask = [ True True True False False],
fill_value=-999)
Nothing happens if `a` is not a masked array.
>>> a = range(5)
>>> a
[0, 1, 2, 3, 4]
>>> ma.set_fill_value(a, 100)
>>> a
[0, 1, 2, 3, 4]
>>> a = np.arange(5)
>>> a
array([0, 1, 2, 3, 4])
>>> ma.set_fill_value(a, 100)
>>> a
array([0, 1, 2, 3, 4])
"""
if isinstance(a, MaskedArray):
a.set_fill_value(fill_value)
return
def get_fill_value(a):
"""
Return the filling value of a, if any. Otherwise, returns the
default filling value for that type.
"""
if isinstance(a, MaskedArray):
result = a.fill_value
else:
result = default_fill_value(a)
return result
def common_fill_value(a, b):
"""
Return the common filling value of two masked arrays, if any.
If ``a.fill_value == b.fill_value``, return the fill value,
otherwise return None.
Parameters
----------
a, b : MaskedArray
The masked arrays for which to compare fill values.
Returns
-------
fill_value : scalar or None
The common fill value, or None.
Examples
--------
>>> x = np.ma.array([0, 1.], fill_value=3)
>>> y = np.ma.array([0, 1.], fill_value=3)
>>> np.ma.common_fill_value(x, y)
3.0
"""
t1 = get_fill_value(a)
t2 = get_fill_value(b)
if t1 == t2:
return t1
return None
def filled(a, fill_value=None):
"""
Return input as an array with masked data replaced by a fill value.
If `a` is not a `MaskedArray`, `a` itself is returned.
If `a` is a `MaskedArray` and `fill_value` is None, `fill_value` is set to
``a.fill_value``.
Parameters
----------
a : MaskedArray or array_like
An input object.
fill_value : scalar, optional
Filling value. Default is None.
Returns
-------
a : ndarray
The filled array.
See Also
--------
compressed
Examples
--------
>>> x = np.ma.array(np.arange(9).reshape(3, 3), mask=[[1, 0, 0],
... [1, 0, 0],
... [0, 0, 0]])
>>> x.filled()
array([[999999, 1, 2],
[999999, 4, 5],
[ 6, 7, 8]])
"""
if hasattr(a, 'filled'):
return a.filled(fill_value)
elif isinstance(a, ndarray):
# Should we check for contiguity ? and a.flags['CONTIGUOUS']:
return a
elif isinstance(a, dict):
return np.array(a, 'O')
else:
return np.array(a)
def get_masked_subclass(*arrays):
"""
Return the youngest subclass of MaskedArray from a list of (masked) arrays.
In case of siblings, the first listed takes over.
"""
if len(arrays) == 1:
arr = arrays[0]
if isinstance(arr, MaskedArray):
rcls = type(arr)
else:
rcls = MaskedArray
else:
arrcls = [type(a) for a in arrays]
rcls = arrcls[0]
if not issubclass(rcls, MaskedArray):
rcls = MaskedArray
for cls in arrcls[1:]:
if issubclass(cls, rcls):
rcls = cls
# Don't return MaskedConstant as result: revert to MaskedArray
if rcls.__name__ == 'MaskedConstant':
return MaskedArray
return rcls
def getdata(a, subok=True):
"""
Return the data of a masked array as an ndarray.
Return the data of `a` (if any) as an ndarray if `a` is a ``MaskedArray``,
else return `a` as a ndarray or subclass (depending on `subok`) if not.
Parameters
----------
a : array_like
Input ``MaskedArray``, alternatively a ndarray or a subclass thereof.
subok : bool
Whether to force the output to be a `pure` ndarray (False) or to
return a subclass of ndarray if appropriate (True, default).
See Also
--------
getmask : Return the mask of a masked array, or nomask.
getmaskarray : Return the mask of a masked array, or full array of False.
Examples
--------
>>> import numpy.ma as ma
>>> a = ma.masked_equal([[1,2],[3,4]], 2)
>>> a
masked_array(data =
[[1 --]
[3 4]],
mask =
[[False True]
[False False]],
fill_value=999999)
>>> ma.getdata(a)
array([[1, 2],
[3, 4]])
Equivalently use the ``MaskedArray`` `data` attribute.
>>> a.data
array([[1, 2],
[3, 4]])
"""
try:
data = a._data
except AttributeError:
data = np.array(a, copy=False, subok=subok)
if not subok:
return data.view(ndarray)
return data
get_data = getdata
def fix_invalid(a, mask=nomask, copy=True, fill_value=None):
"""
Return input with invalid data masked and replaced by a fill value.
Invalid data means values of `nan`, `inf`, etc.
Parameters
----------
a : array_like
Input array, a (subclass of) ndarray.
mask : sequence, optional
Mask. Must be convertible to an array of booleans with the same
shape as `data`. True indicates a masked (i.e. invalid) data.
copy : bool, optional
Whether to use a copy of `a` (True) or to fix `a` in place (False).
Default is True.
fill_value : scalar, optional
Value used for fixing invalid data. Default is None, in which case
the ``a.fill_value`` is used.
Returns
-------
b : MaskedArray
The input array with invalid entries fixed.
Notes
-----
A copy is performed by default.
Examples
--------
>>> x = np.ma.array([1., -1, np.nan, np.inf], mask=[1] + [0]*3)
>>> x
masked_array(data = [-- -1.0 nan inf],
mask = [ True False False False],
fill_value = 1e+20)
>>> np.ma.fix_invalid(x)
masked_array(data = [-- -1.0 -- --],
mask = [ True False True True],
fill_value = 1e+20)
>>> fixed = np.ma.fix_invalid(x)
>>> fixed.data
array([ 1.00000000e+00, -1.00000000e+00, 1.00000000e+20,
1.00000000e+20])
>>> x.data
array([ 1., -1., NaN, Inf])
"""
a = masked_array(a, copy=copy, mask=mask, subok=True)
invalid = np.logical_not(np.isfinite(a._data))
if not invalid.any():
return a
a._mask |= invalid
if fill_value is None:
fill_value = a.fill_value
a._data[invalid] = fill_value
return a
###############################################################################
# Ufuncs #
###############################################################################
ufunc_domain = {}
ufunc_fills = {}
class _DomainCheckInterval:
"""
Define a valid interval, so that :
``domain_check_interval(a,b)(x) == True`` where
``x < a`` or ``x > b``.
"""
def __init__(self, a, b):
"domain_check_interval(a,b)(x) = true where x < a or y > b"
if (a > b):
(a, b) = (b, a)
self.a = a
self.b = b
def __call__(self, x):
"Execute the call behavior."
# nans at masked positions cause RuntimeWarnings, even though
# they are masked. To avoid this we suppress warnings.
with np.errstate(invalid='ignore'):
return umath.logical_or(umath.greater(x, self.b),
umath.less(x, self.a))
class _DomainTan:
"""
Define a valid interval for the `tan` function, so that:
``domain_tan(eps) = True`` where ``abs(cos(x)) < eps``
"""
def __init__(self, eps):
"domain_tan(eps) = true where abs(cos(x)) < eps)"
self.eps = eps
def __call__(self, x):
"Executes the call behavior."
with np.errstate(invalid='ignore'):
return umath.less(umath.absolute(umath.cos(x)), self.eps)
class _DomainSafeDivide:
"""
Define a domain for safe division.
"""
def __init__(self, tolerance=None):
self.tolerance = tolerance
def __call__(self, a, b):
# Delay the selection of the tolerance to here in order to reduce numpy
# import times. The calculation of these parameters is a substantial
# component of numpy's import time.
if self.tolerance is None:
self.tolerance = np.finfo(float).tiny
# don't call ma ufuncs from __array_wrap__ which would fail for scalars
a, b = np.asarray(a), np.asarray(b)
with np.errstate(invalid='ignore'):
return umath.absolute(a) * self.tolerance >= umath.absolute(b)
class _DomainGreater:
"""
DomainGreater(v)(x) is True where x <= v.
"""
def __init__(self, critical_value):
"DomainGreater(v)(x) = true where x <= v"
self.critical_value = critical_value
def __call__(self, x):
"Executes the call behavior."
with np.errstate(invalid='ignore'):
return umath.less_equal(x, self.critical_value)
class _DomainGreaterEqual:
"""
DomainGreaterEqual(v)(x) is True where x < v.
"""
def __init__(self, critical_value):
"DomainGreaterEqual(v)(x) = true where x < v"
self.critical_value = critical_value
def __call__(self, x):
"Executes the call behavior."
with np.errstate(invalid='ignore'):
return umath.less(x, self.critical_value)
class _MaskedUnaryOperation:
"""
Defines masked version of unary operations, where invalid values are
pre-masked.
Parameters
----------
mufunc : callable
The function for which to define a masked version. Made available
as ``_MaskedUnaryOperation.f``.
fill : scalar, optional
Filling value, default is 0.
domain : class instance
Domain for the function. Should be one of the ``_Domain*``
classes. Default is None.
"""
def __init__(self, mufunc, fill=0, domain=None):
self.f = mufunc
self.fill = fill
self.domain = domain
self.__doc__ = getattr(mufunc, "__doc__", str(mufunc))
self.__name__ = getattr(mufunc, "__name__", str(mufunc))
ufunc_domain[mufunc] = domain
ufunc_fills[mufunc] = fill
def __call__(self, a, *args, **kwargs):
"""
Execute the call behavior.
"""
d = getdata(a)
# Deal with domain
if self.domain is not None:
# Case 1.1. : Domained function
# nans at masked positions cause RuntimeWarnings, even though
# they are masked. To avoid this we suppress warnings.
with np.errstate(divide='ignore', invalid='ignore'):
result = self.f(d, *args, **kwargs)
# Make a mask
m = ~umath.isfinite(result)
m |= self.domain(d)
m |= getmask(a)
else:
# Case 1.2. : Function without a domain
# Get the result and the mask
with np.errstate(divide='ignore', invalid='ignore'):
result = self.f(d, *args, **kwargs)
m = getmask(a)
if not result.ndim:
# Case 2.1. : The result is scalarscalar
if m:
return masked
return result
if m is not nomask:
# Case 2.2. The result is an array
# We need to fill the invalid data back w/ the input Now,
# that's plain silly: in C, we would just skip the element and
# keep the original, but we do have to do it that way in Python
# In case result has a lower dtype than the inputs (as in
# equal)
try:
np.copyto(result, d, where=m)
except TypeError:
pass
# Transform to
masked_result = result.view(get_masked_subclass(a))
masked_result._mask = m
masked_result._update_from(a)
return masked_result
def __str__(self):
return "Masked version of %s. [Invalid values are masked]" % str(self.f)
class _MaskedBinaryOperation:
"""
Define masked version of binary operations, where invalid
values are pre-masked.
Parameters
----------
mbfunc : function
The function for which to define a masked version. Made available
as ``_MaskedBinaryOperation.f``.
domain : class instance
Default domain for the function. Should be one of the ``_Domain*``
classes. Default is None.
fillx : scalar, optional
Filling value for the first argument, default is 0.
filly : scalar, optional
Filling value for the second argument, default is 0.
"""
def __init__(self, mbfunc, fillx=0, filly=0):
"""
abfunc(fillx, filly) must be defined.
abfunc(x, filly) = x for all x to enable reduce.
"""
self.f = mbfunc
self.fillx = fillx
self.filly = filly
self.__doc__ = getattr(mbfunc, "__doc__", str(mbfunc))
self.__name__ = getattr(mbfunc, "__name__", str(mbfunc))
ufunc_domain[mbfunc] = None
ufunc_fills[mbfunc] = (fillx, filly)
def __call__(self, a, b, *args, **kwargs):
"""
Execute the call behavior.
"""
# Get the data, as ndarray
(da, db) = (getdata(a), getdata(b))
# Get the result
with np.errstate():
np.seterr(divide='ignore', invalid='ignore')
result = self.f(da, db, *args, **kwargs)
# Get the mask for the result
(ma, mb) = (getmask(a), getmask(b))
if ma is nomask:
if mb is nomask:
m = nomask
else:
m = umath.logical_or(getmaskarray(a), mb)
elif mb is nomask:
m = umath.logical_or(ma, getmaskarray(b))
else:
m = umath.logical_or(ma, mb)
# Case 1. : scalar
if not result.ndim:
if m:
return masked
return result
# Case 2. : array
# Revert result to da where masked
if m is not nomask and m.any():
# any errors, just abort; impossible to guarantee masked values
try:
np.copyto(result, da, casting='unsafe', where=m)
except:
pass
# Transforms to a (subclass of) MaskedArray
masked_result = result.view(get_masked_subclass(a, b))
masked_result._mask = m
if isinstance(a, MaskedArray):
masked_result._update_from(a)
elif isinstance(b, MaskedArray):
masked_result._update_from(b)
return masked_result
def reduce(self, target, axis=0, dtype=None):
"""
Reduce `target` along the given `axis`.
"""
tclass = get_masked_subclass(target)
m = getmask(target)
t = filled(target, self.filly)
if t.shape == ():
t = t.reshape(1)
if m is not nomask:
m = make_mask(m, copy=1)
m.shape = (1,)
if m is nomask:
tr = self.f.reduce(t, axis)
mr = nomask
else:
tr = self.f.reduce(t, axis, dtype=dtype or t.dtype)
mr = umath.logical_and.reduce(m, axis)
if not tr.shape:
if mr:
return masked
else:
return tr
masked_tr = tr.view(tclass)
masked_tr._mask = mr
return masked_tr
def outer(self, a, b):
"""
Return the function applied to the outer product of a and b.
"""
(da, db) = (getdata(a), getdata(b))
d = self.f.outer(da, db)
ma = getmask(a)
mb = getmask(b)
if ma is nomask and mb is nomask:
m = nomask
else:
ma = getmaskarray(a)
mb = getmaskarray(b)
m = umath.logical_or.outer(ma, mb)
if (not m.ndim) and m:
return masked
if m is not nomask:
np.copyto(d, da, where=m)
if not d.shape:
return d
masked_d = d.view(get_masked_subclass(a, b))
masked_d._mask = m
return masked_d
def accumulate(self, target, axis=0):
"""Accumulate `target` along `axis` after filling with y fill
value.
"""
tclass = get_masked_subclass(target)
t = filled(target, self.filly)
result = self.f.accumulate(t, axis)
masked_result = result.view(tclass)
return masked_result
def __str__(self):
return "Masked version of " + str(self.f)
class _DomainedBinaryOperation:
"""
Define binary operations that have a domain, like divide.
They have no reduce, outer or accumulate.
Parameters
----------
mbfunc : function
The function for which to define a masked version. Made available
as ``_DomainedBinaryOperation.f``.
domain : class instance
Default domain for the function. Should be one of the ``_Domain*``
classes.
fillx : scalar, optional
Filling value for the first argument, default is 0.
filly : scalar, optional
Filling value for the second argument, default is 0.
"""
def __init__(self, dbfunc, domain, fillx=0, filly=0):
"""abfunc(fillx, filly) must be defined.
abfunc(x, filly) = x for all x to enable reduce.
"""
self.f = dbfunc
self.domain = domain
self.fillx = fillx
self.filly = filly
self.__doc__ = getattr(dbfunc, "__doc__", str(dbfunc))
self.__name__ = getattr(dbfunc, "__name__", str(dbfunc))
ufunc_domain[dbfunc] = domain
ufunc_fills[dbfunc] = (fillx, filly)
def __call__(self, a, b, *args, **kwargs):
"Execute the call behavior."
# Get the data
(da, db) = (getdata(a), getdata(b))
# Get the result
with np.errstate(divide='ignore', invalid='ignore'):
result = self.f(da, db, *args, **kwargs)
# Get the mask as a combination of the source masks and invalid
m = ~umath.isfinite(result)
m |= getmask(a)
m |= getmask(b)
# Apply the domain
domain = ufunc_domain.get(self.f, None)
if domain is not None:
m |= domain(da, db)
# Take care of the scalar case first
if (not m.ndim):
if m:
return masked
else:
return result
# When the mask is True, put back da if possible
# any errors, just abort; impossible to guarantee masked values
try:
np.copyto(result, 0, casting='unsafe', where=m)
# avoid using "*" since this may be overlaid
masked_da = umath.multiply(m, da)
# only add back if it can be cast safely
if np.can_cast(masked_da.dtype, result.dtype, casting='safe'):
result += masked_da
except:
pass
# Transforms to a (subclass of) MaskedArray
masked_result = result.view(get_masked_subclass(a, b))
masked_result._mask = m
if isinstance(a, MaskedArray):
masked_result._update_from(a)
elif isinstance(b, MaskedArray):
masked_result._update_from(b)
return masked_result
def __str__(self):
return "Masked version of " + str(self.f)
# Unary ufuncs
exp = _MaskedUnaryOperation(umath.exp)
conjugate = _MaskedUnaryOperation(umath.conjugate)
sin = _MaskedUnaryOperation(umath.sin)
cos = _MaskedUnaryOperation(umath.cos)
tan = _MaskedUnaryOperation(umath.tan)
arctan = _MaskedUnaryOperation(umath.arctan)
arcsinh = _MaskedUnaryOperation(umath.arcsinh)
sinh = _MaskedUnaryOperation(umath.sinh)
cosh = _MaskedUnaryOperation(umath.cosh)
tanh = _MaskedUnaryOperation(umath.tanh)
abs = absolute = _MaskedUnaryOperation(umath.absolute)
angle = _MaskedUnaryOperation(angle) # from numpy.lib.function_base
fabs = _MaskedUnaryOperation(umath.fabs)
negative = _MaskedUnaryOperation(umath.negative)
floor = _MaskedUnaryOperation(umath.floor)
ceil = _MaskedUnaryOperation(umath.ceil)
around = _MaskedUnaryOperation(np.round_)
logical_not = _MaskedUnaryOperation(umath.logical_not)
# Domained unary ufuncs
sqrt = _MaskedUnaryOperation(umath.sqrt, 0.0,
_DomainGreaterEqual(0.0))
log = _MaskedUnaryOperation(umath.log, 1.0,
_DomainGreater(0.0))
log2 = _MaskedUnaryOperation(umath.log2, 1.0,
_DomainGreater(0.0))
log10 = _MaskedUnaryOperation(umath.log10, 1.0,
_DomainGreater(0.0))
tan = _MaskedUnaryOperation(umath.tan, 0.0,
_DomainTan(1e-35))
arcsin = _MaskedUnaryOperation(umath.arcsin, 0.0,
_DomainCheckInterval(-1.0, 1.0))
arccos = _MaskedUnaryOperation(umath.arccos, 0.0,
_DomainCheckInterval(-1.0, 1.0))
arccosh = _MaskedUnaryOperation(umath.arccosh, 1.0,
_DomainGreaterEqual(1.0))
arctanh = _MaskedUnaryOperation(umath.arctanh, 0.0,
_DomainCheckInterval(-1.0 + 1e-15, 1.0 - 1e-15))
# Binary ufuncs
add = _MaskedBinaryOperation(umath.add)
subtract = _MaskedBinaryOperation(umath.subtract)
multiply = _MaskedBinaryOperation(umath.multiply, 1, 1)
arctan2 = _MaskedBinaryOperation(umath.arctan2, 0.0, 1.0)
equal = _MaskedBinaryOperation(umath.equal)
equal.reduce = None
not_equal = _MaskedBinaryOperation(umath.not_equal)
not_equal.reduce = None
less_equal = _MaskedBinaryOperation(umath.less_equal)
less_equal.reduce = None
greater_equal = _MaskedBinaryOperation(umath.greater_equal)
greater_equal.reduce = None
less = _MaskedBinaryOperation(umath.less)
less.reduce = None
greater = _MaskedBinaryOperation(umath.greater)
greater.reduce = None
logical_and = _MaskedBinaryOperation(umath.logical_and)
alltrue = _MaskedBinaryOperation(umath.logical_and, 1, 1).reduce
logical_or = _MaskedBinaryOperation(umath.logical_or)
sometrue = logical_or.reduce
logical_xor = _MaskedBinaryOperation(umath.logical_xor)
bitwise_and = _MaskedBinaryOperation(umath.bitwise_and)
bitwise_or = _MaskedBinaryOperation(umath.bitwise_or)
bitwise_xor = _MaskedBinaryOperation(umath.bitwise_xor)
hypot = _MaskedBinaryOperation(umath.hypot)
# Domained binary ufuncs
divide = _DomainedBinaryOperation(umath.divide, _DomainSafeDivide(), 0, 1)
true_divide = _DomainedBinaryOperation(umath.true_divide,
_DomainSafeDivide(), 0, 1)
floor_divide = _DomainedBinaryOperation(umath.floor_divide,
_DomainSafeDivide(), 0, 1)
remainder = _DomainedBinaryOperation(umath.remainder,
_DomainSafeDivide(), 0, 1)
fmod = _DomainedBinaryOperation(umath.fmod, _DomainSafeDivide(), 0, 1)
mod = _DomainedBinaryOperation(umath.mod, _DomainSafeDivide(), 0, 1)
###############################################################################
# Mask creation functions #
###############################################################################
def _replace_dtype_fields_recursive(dtype, primitive_dtype):
"Private function allowing recursion in _replace_dtype_fields."
_recurse = _replace_dtype_fields_recursive
# Do we have some name fields ?
if dtype.names:
descr = []
for name in dtype.names:
field = dtype.fields[name]
if len(field) == 3:
# Prepend the title to the name
name = (field[-1], name)
descr.append((name, _recurse(field[0], primitive_dtype)))
new_dtype = np.dtype(descr)
# Is this some kind of composite a la (np.float,2)
elif dtype.subdtype:
descr = list(dtype.subdtype)
descr[0] = _recurse(dtype.subdtype[0], primitive_dtype)
new_dtype = np.dtype(tuple(descr))
# this is a primitive type, so do a direct replacement
else:
new_dtype = primitive_dtype
# preserve identity of dtypes
if new_dtype == dtype:
new_dtype = dtype
return new_dtype
def _replace_dtype_fields(dtype, primitive_dtype):
"""
Construct a dtype description list from a given dtype.
Returns a new dtype object, with all fields and subtypes in the given type
recursively replaced with `primitive_dtype`.
Arguments are coerced to dtypes first.
"""
dtype = np.dtype(dtype)
primitive_dtype = np.dtype(primitive_dtype)
return _replace_dtype_fields_recursive(dtype, primitive_dtype)
def make_mask_descr(ndtype):
"""
Construct a dtype description list from a given dtype.
Returns a new dtype object, with the type of all fields in `ndtype` to a
boolean type. Field names are not altered.
Parameters
----------
ndtype : dtype
The dtype to convert.
Returns
-------
result : dtype
A dtype that looks like `ndtype`, the type of all fields is boolean.
Examples
--------
>>> import numpy.ma as ma
>>> dtype = np.dtype({'names':['foo', 'bar'],
'formats':[np.float32, np.int]})
>>> dtype
dtype([('foo', '<f4'), ('bar', '<i4')])
>>> ma.make_mask_descr(dtype)
dtype([('foo', '|b1'), ('bar', '|b1')])
>>> ma.make_mask_descr(np.float32)
dtype('bool')
"""
return _replace_dtype_fields(ndtype, MaskType)
def getmask(a):
"""
Return the mask of a masked array, or nomask.
Return the mask of `a` as an ndarray if `a` is a `MaskedArray` and the
mask is not `nomask`, else return `nomask`. To guarantee a full array
of booleans of the same shape as a, use `getmaskarray`.
Parameters
----------
a : array_like
Input `MaskedArray` for which the mask is required.
See Also
--------
getdata : Return the data of a masked array as an ndarray.
getmaskarray : Return the mask of a masked array, or full array of False.
Examples
--------
>>> import numpy.ma as ma
>>> a = ma.masked_equal([[1,2],[3,4]], 2)
>>> a
masked_array(data =
[[1 --]
[3 4]],
mask =
[[False True]
[False False]],
fill_value=999999)
>>> ma.getmask(a)
array([[False, True],
[False, False]], dtype=bool)
Equivalently use the `MaskedArray` `mask` attribute.
>>> a.mask
array([[False, True],
[False, False]], dtype=bool)
Result when mask == `nomask`
>>> b = ma.masked_array([[1,2],[3,4]])
>>> b
masked_array(data =
[[1 2]
[3 4]],
mask =
False,
fill_value=999999)
>>> ma.nomask
False
>>> ma.getmask(b) == ma.nomask
True
>>> b.mask == ma.nomask
True
"""
return getattr(a, '_mask', nomask)
get_mask = getmask
def getmaskarray(arr):
"""
Return the mask of a masked array, or full boolean array of False.
Return the mask of `arr` as an ndarray if `arr` is a `MaskedArray` and
the mask is not `nomask`, else return a full boolean array of False of
the same shape as `arr`.
Parameters
----------
arr : array_like
Input `MaskedArray` for which the mask is required.
See Also
--------
getmask : Return the mask of a masked array, or nomask.
getdata : Return the data of a masked array as an ndarray.
Examples
--------
>>> import numpy.ma as ma
>>> a = ma.masked_equal([[1,2],[3,4]], 2)
>>> a
masked_array(data =
[[1 --]
[3 4]],
mask =
[[False True]
[False False]],
fill_value=999999)
>>> ma.getmaskarray(a)
array([[False, True],
[False, False]], dtype=bool)
Result when mask == ``nomask``
>>> b = ma.masked_array([[1,2],[3,4]])
>>> b
masked_array(data =
[[1 2]
[3 4]],
mask =
False,
fill_value=999999)
>>> >ma.getmaskarray(b)
array([[False, False],
[False, False]], dtype=bool)
"""
mask = getmask(arr)
if mask is nomask:
mask = make_mask_none(np.shape(arr), getattr(arr, 'dtype', None))
return mask
def is_mask(m):
"""
Return True if m is a valid, standard mask.
This function does not check the contents of the input, only that the
type is MaskType. In particular, this function returns False if the
mask has a flexible dtype.
Parameters
----------
m : array_like
Array to test.
Returns
-------
result : bool
True if `m.dtype.type` is MaskType, False otherwise.
See Also
--------
isMaskedArray : Test whether input is an instance of MaskedArray.
Examples
--------
>>> import numpy.ma as ma
>>> m = ma.masked_equal([0, 1, 0, 2, 3], 0)
>>> m
masked_array(data = [-- 1 -- 2 3],
mask = [ True False True False False],
fill_value=999999)
>>> ma.is_mask(m)
False
>>> ma.is_mask(m.mask)
True
Input must be an ndarray (or have similar attributes)
for it to be considered a valid mask.
>>> m = [False, True, False]
>>> ma.is_mask(m)
False
>>> m = np.array([False, True, False])
>>> m
array([False, True, False], dtype=bool)
>>> ma.is_mask(m)
True
Arrays with complex dtypes don't return True.
>>> dtype = np.dtype({'names':['monty', 'pithon'],
'formats':[np.bool, np.bool]})
>>> dtype
dtype([('monty', '|b1'), ('pithon', '|b1')])
>>> m = np.array([(True, False), (False, True), (True, False)],
dtype=dtype)
>>> m
array([(True, False), (False, True), (True, False)],
dtype=[('monty', '|b1'), ('pithon', '|b1')])
>>> ma.is_mask(m)
False
"""
try:
return m.dtype.type is MaskType
except AttributeError:
return False
def make_mask(m, copy=False, shrink=True, dtype=MaskType):
"""
Create a boolean mask from an array.
Return `m` as a boolean mask, creating a copy if necessary or requested.
The function can accept any sequence that is convertible to integers,
or ``nomask``. Does not require that contents must be 0s and 1s, values
of 0 are interepreted as False, everything else as True.
Parameters
----------
m : array_like
Potential mask.
copy : bool, optional
Whether to return a copy of `m` (True) or `m` itself (False).
shrink : bool, optional
Whether to shrink `m` to ``nomask`` if all its values are False.
dtype : dtype, optional
Data-type of the output mask. By default, the output mask has a
dtype of MaskType (bool). If the dtype is flexible, each field has
a boolean dtype. This is ignored when `m` is ``nomask``, in which
case ``nomask`` is always returned.
Returns
-------
result : ndarray
A boolean mask derived from `m`.
Examples
--------
>>> import numpy.ma as ma
>>> m = [True, False, True, True]
>>> ma.make_mask(m)
array([ True, False, True, True], dtype=bool)
>>> m = [1, 0, 1, 1]
>>> ma.make_mask(m)
array([ True, False, True, True], dtype=bool)
>>> m = [1, 0, 2, -3]
>>> ma.make_mask(m)
array([ True, False, True, True], dtype=bool)
Effect of the `shrink` parameter.
>>> m = np.zeros(4)
>>> m
array([ 0., 0., 0., 0.])
>>> ma.make_mask(m)
False
>>> ma.make_mask(m, shrink=False)
array([False, False, False, False], dtype=bool)
Using a flexible `dtype`.
>>> m = [1, 0, 1, 1]
>>> n = [0, 1, 0, 0]
>>> arr = []
>>> for man, mouse in zip(m, n):
... arr.append((man, mouse))
>>> arr
[(1, 0), (0, 1), (1, 0), (1, 0)]
>>> dtype = np.dtype({'names':['man', 'mouse'],
'formats':[np.int, np.int]})
>>> arr = np.array(arr, dtype=dtype)
>>> arr
array([(1, 0), (0, 1), (1, 0), (1, 0)],
dtype=[('man', '<i4'), ('mouse', '<i4')])
>>> ma.make_mask(arr, dtype=dtype)
array([(True, False), (False, True), (True, False), (True, False)],
dtype=[('man', '|b1'), ('mouse', '|b1')])
"""
if m is nomask:
return nomask
# Make sure the input dtype is valid.
dtype = make_mask_descr(dtype)
# Fill the mask in case there are missing data; turn it into an ndarray.
result = np.array(filled(m, True), copy=copy, dtype=dtype, subok=True)
# Bas les masques !
if shrink and (not result.dtype.names) and (not result.any()):
return nomask
else:
return result
def make_mask_none(newshape, dtype=None):
"""
Return a boolean mask of the given shape, filled with False.
This function returns a boolean ndarray with all entries False, that can
be used in common mask manipulations. If a complex dtype is specified, the
type of each field is converted to a boolean type.
Parameters
----------
newshape : tuple
A tuple indicating the shape of the mask.
dtype : {None, dtype}, optional
If None, use a MaskType instance. Otherwise, use a new datatype with
the same fields as `dtype`, converted to boolean types.
Returns
-------
result : ndarray
An ndarray of appropriate shape and dtype, filled with False.
See Also
--------
make_mask : Create a boolean mask from an array.
make_mask_descr : Construct a dtype description list from a given dtype.
Examples
--------
>>> import numpy.ma as ma
>>> ma.make_mask_none((3,))
array([False, False, False], dtype=bool)
Defining a more complex dtype.
>>> dtype = np.dtype({'names':['foo', 'bar'],
'formats':[np.float32, np.int]})
>>> dtype
dtype([('foo', '<f4'), ('bar', '<i4')])
>>> ma.make_mask_none((3,), dtype=dtype)
array([(False, False), (False, False), (False, False)],
dtype=[('foo', '|b1'), ('bar', '|b1')])
"""
if dtype is None:
result = np.zeros(newshape, dtype=MaskType)
else:
result = np.zeros(newshape, dtype=make_mask_descr(dtype))
return result
def mask_or(m1, m2, copy=False, shrink=True):
"""
Combine two masks with the ``logical_or`` operator.
The result may be a view on `m1` or `m2` if the other is `nomask`
(i.e. False).
Parameters
----------
m1, m2 : array_like
Input masks.
copy : bool, optional
If copy is False and one of the inputs is `nomask`, return a view
of the other input mask. Defaults to False.
shrink : bool, optional
Whether to shrink the output to `nomask` if all its values are
False. Defaults to True.
Returns
-------
mask : output mask
The result masks values that are masked in either `m1` or `m2`.
Raises
------
ValueError
If `m1` and `m2` have different flexible dtypes.
Examples
--------
>>> m1 = np.ma.make_mask([0, 1, 1, 0])
>>> m2 = np.ma.make_mask([1, 0, 0, 0])
>>> np.ma.mask_or(m1, m2)
array([ True, True, True, False], dtype=bool)
"""
def _recursive_mask_or(m1, m2, newmask):
names = m1.dtype.names
for name in names:
current1 = m1[name]
if current1.dtype.names:
_recursive_mask_or(current1, m2[name], newmask[name])
else:
umath.logical_or(current1, m2[name], newmask[name])
return
if (m1 is nomask) or (m1 is False):
dtype = getattr(m2, 'dtype', MaskType)
return make_mask(m2, copy=copy, shrink=shrink, dtype=dtype)
if (m2 is nomask) or (m2 is False):
dtype = getattr(m1, 'dtype', MaskType)
return make_mask(m1, copy=copy, shrink=shrink, dtype=dtype)
if m1 is m2 and is_mask(m1):
return m1
(dtype1, dtype2) = (getattr(m1, 'dtype', None), getattr(m2, 'dtype', None))
if (dtype1 != dtype2):
raise ValueError("Incompatible dtypes '%s'<>'%s'" % (dtype1, dtype2))
if dtype1.names:
# Allocate an output mask array with the properly broadcast shape.
newmask = np.empty(np.broadcast(m1, m2).shape, dtype1)
_recursive_mask_or(m1, m2, newmask)
return newmask
return make_mask(umath.logical_or(m1, m2), copy=copy, shrink=shrink)
def flatten_mask(mask):
"""
Returns a completely flattened version of the mask, where nested fields
are collapsed.
Parameters
----------
mask : array_like
Input array, which will be interpreted as booleans.
Returns
-------
flattened_mask : ndarray of bools
The flattened input.
Examples
--------
>>> mask = np.array([0, 0, 1], dtype=np.bool)
>>> flatten_mask(mask)
array([False, False, True], dtype=bool)
>>> mask = np.array([(0, 0), (0, 1)], dtype=[('a', bool), ('b', bool)])
>>> flatten_mask(mask)
array([False, False, False, True], dtype=bool)
>>> mdtype = [('a', bool), ('b', [('ba', bool), ('bb', bool)])]
>>> mask = np.array([(0, (0, 0)), (0, (0, 1))], dtype=mdtype)
>>> flatten_mask(mask)
array([False, False, False, False, False, True], dtype=bool)
"""
def _flatmask(mask):
"Flatten the mask and returns a (maybe nested) sequence of booleans."
mnames = mask.dtype.names
if mnames:
return [flatten_mask(mask[name]) for name in mnames]
else:
return mask
def _flatsequence(sequence):
"Generates a flattened version of the sequence."
try:
for element in sequence:
if hasattr(element, '__iter__'):
for f in _flatsequence(element):
yield f
else:
yield element
except TypeError:
yield sequence
mask = np.asarray(mask)
flattened = _flatsequence(_flatmask(mask))
return np.array([_ for _ in flattened], dtype=bool)
def _check_mask_axis(mask, axis, keepdims=np._NoValue):
"Check whether there are masked values along the given axis"
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
if mask is not nomask:
return mask.all(axis=axis, **kwargs)
return nomask
###############################################################################
# Masking functions #
###############################################################################
def masked_where(condition, a, copy=True):
"""
Mask an array where a condition is met.
Return `a` as an array masked where `condition` is True.
Any masked values of `a` or `condition` are also masked in the output.
Parameters
----------
condition : array_like
Masking condition. When `condition` tests floating point values for
equality, consider using ``masked_values`` instead.
a : array_like
Array to mask.
copy : bool
If True (default) make a copy of `a` in the result. If False modify
`a` in place and return a view.
Returns
-------
result : MaskedArray
The result of masking `a` where `condition` is True.
See Also
--------
masked_values : Mask using floating point equality.
masked_equal : Mask where equal to a given value.
masked_not_equal : Mask where `not` equal to a given value.
masked_less_equal : Mask where less than or equal to a given value.
masked_greater_equal : Mask where greater than or equal to a given value.
masked_less : Mask where less than a given value.
masked_greater : Mask where greater than a given value.
masked_inside : Mask inside a given interval.
masked_outside : Mask outside a given interval.
masked_invalid : Mask invalid values (NaNs or infs).
Examples
--------
>>> import numpy.ma as ma
>>> a = np.arange(4)
>>> a
array([0, 1, 2, 3])
>>> ma.masked_where(a <= 2, a)
masked_array(data = [-- -- -- 3],
mask = [ True True True False],
fill_value=999999)
Mask array `b` conditional on `a`.
>>> b = ['a', 'b', 'c', 'd']
>>> ma.masked_where(a == 2, b)
masked_array(data = [a b -- d],
mask = [False False True False],
fill_value=N/A)
Effect of the `copy` argument.
>>> c = ma.masked_where(a <= 2, a)
>>> c
masked_array(data = [-- -- -- 3],
mask = [ True True True False],
fill_value=999999)
>>> c[0] = 99
>>> c
masked_array(data = [99 -- -- 3],
mask = [False True True False],
fill_value=999999)
>>> a
array([0, 1, 2, 3])
>>> c = ma.masked_where(a <= 2, a, copy=False)
>>> c[0] = 99
>>> c
masked_array(data = [99 -- -- 3],
mask = [False True True False],
fill_value=999999)
>>> a
array([99, 1, 2, 3])
When `condition` or `a` contain masked values.
>>> a = np.arange(4)
>>> a = ma.masked_where(a == 2, a)
>>> a
masked_array(data = [0 1 -- 3],
mask = [False False True False],
fill_value=999999)
>>> b = np.arange(4)
>>> b = ma.masked_where(b == 0, b)
>>> b
masked_array(data = [-- 1 2 3],
mask = [ True False False False],
fill_value=999999)
>>> ma.masked_where(a == 3, b)
masked_array(data = [-- 1 -- --],
mask = [ True False True True],
fill_value=999999)
"""
# Make sure that condition is a valid standard-type mask.
cond = make_mask(condition)
a = np.array(a, copy=copy, subok=True)
(cshape, ashape) = (cond.shape, a.shape)
if cshape and cshape != ashape:
raise IndexError("Inconsistent shape between the condition and the input"
" (got %s and %s)" % (cshape, ashape))
if hasattr(a, '_mask'):
cond = mask_or(cond, a._mask)
cls = type(a)
else:
cls = MaskedArray
result = a.view(cls)
# Assign to *.mask so that structured masks are handled correctly.
result.mask = cond
return result
def masked_greater(x, value, copy=True):
"""
Mask an array where greater than a given value.
This function is a shortcut to ``masked_where``, with
`condition` = (x > value).
See Also
--------
masked_where : Mask where a condition is met.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.arange(4)
>>> a
array([0, 1, 2, 3])
>>> ma.masked_greater(a, 2)
masked_array(data = [0 1 2 --],
mask = [False False False True],
fill_value=999999)
"""
return masked_where(greater(x, value), x, copy=copy)
def masked_greater_equal(x, value, copy=True):
"""
Mask an array where greater than or equal to a given value.
This function is a shortcut to ``masked_where``, with
`condition` = (x >= value).
See Also
--------
masked_where : Mask where a condition is met.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.arange(4)
>>> a
array([0, 1, 2, 3])
>>> ma.masked_greater_equal(a, 2)
masked_array(data = [0 1 -- --],
mask = [False False True True],
fill_value=999999)
"""
return masked_where(greater_equal(x, value), x, copy=copy)
def masked_less(x, value, copy=True):
"""
Mask an array where less than a given value.
This function is a shortcut to ``masked_where``, with
`condition` = (x < value).
See Also
--------
masked_where : Mask where a condition is met.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.arange(4)
>>> a
array([0, 1, 2, 3])
>>> ma.masked_less(a, 2)
masked_array(data = [-- -- 2 3],
mask = [ True True False False],
fill_value=999999)
"""
return masked_where(less(x, value), x, copy=copy)
def masked_less_equal(x, value, copy=True):
"""
Mask an array where less than or equal to a given value.
This function is a shortcut to ``masked_where``, with
`condition` = (x <= value).
See Also
--------
masked_where : Mask where a condition is met.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.arange(4)
>>> a
array([0, 1, 2, 3])
>>> ma.masked_less_equal(a, 2)
masked_array(data = [-- -- -- 3],
mask = [ True True True False],
fill_value=999999)
"""
return masked_where(less_equal(x, value), x, copy=copy)
def masked_not_equal(x, value, copy=True):
"""
Mask an array where `not` equal to a given value.
This function is a shortcut to ``masked_where``, with
`condition` = (x != value).
See Also
--------
masked_where : Mask where a condition is met.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.arange(4)
>>> a
array([0, 1, 2, 3])
>>> ma.masked_not_equal(a, 2)
masked_array(data = [-- -- 2 --],
mask = [ True True False True],
fill_value=999999)
"""
return masked_where(not_equal(x, value), x, copy=copy)
def masked_equal(x, value, copy=True):
"""
Mask an array where equal to a given value.
This function is a shortcut to ``masked_where``, with
`condition` = (x == value). For floating point arrays,
consider using ``masked_values(x, value)``.
See Also
--------
masked_where : Mask where a condition is met.
masked_values : Mask using floating point equality.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.arange(4)
>>> a
array([0, 1, 2, 3])
>>> ma.masked_equal(a, 2)
masked_array(data = [0 1 -- 3],
mask = [False False True False],
fill_value=999999)
"""
output = masked_where(equal(x, value), x, copy=copy)
output.fill_value = value
return output
def masked_inside(x, v1, v2, copy=True):
"""
Mask an array inside a given interval.
Shortcut to ``masked_where``, where `condition` is True for `x` inside
the interval [v1,v2] (v1 <= x <= v2). The boundaries `v1` and `v2`
can be given in either order.
See Also
--------
masked_where : Mask where a condition is met.
Notes
-----
The array `x` is prefilled with its filling value.
Examples
--------
>>> import numpy.ma as ma
>>> x = [0.31, 1.2, 0.01, 0.2, -0.4, -1.1]
>>> ma.masked_inside(x, -0.3, 0.3)
masked_array(data = [0.31 1.2 -- -- -0.4 -1.1],
mask = [False False True True False False],
fill_value=1e+20)
The order of `v1` and `v2` doesn't matter.
>>> ma.masked_inside(x, 0.3, -0.3)
masked_array(data = [0.31 1.2 -- -- -0.4 -1.1],
mask = [False False True True False False],
fill_value=1e+20)
"""
if v2 < v1:
(v1, v2) = (v2, v1)
xf = filled(x)
condition = (xf >= v1) & (xf <= v2)
return masked_where(condition, x, copy=copy)
def masked_outside(x, v1, v2, copy=True):
"""
Mask an array outside a given interval.
Shortcut to ``masked_where``, where `condition` is True for `x` outside
the interval [v1,v2] (x < v1)|(x > v2).
The boundaries `v1` and `v2` can be given in either order.
See Also
--------
masked_where : Mask where a condition is met.
Notes
-----
The array `x` is prefilled with its filling value.
Examples
--------
>>> import numpy.ma as ma
>>> x = [0.31, 1.2, 0.01, 0.2, -0.4, -1.1]
>>> ma.masked_outside(x, -0.3, 0.3)
masked_array(data = [-- -- 0.01 0.2 -- --],
mask = [ True True False False True True],
fill_value=1e+20)
The order of `v1` and `v2` doesn't matter.
>>> ma.masked_outside(x, 0.3, -0.3)
masked_array(data = [-- -- 0.01 0.2 -- --],
mask = [ True True False False True True],
fill_value=1e+20)
"""
if v2 < v1:
(v1, v2) = (v2, v1)
xf = filled(x)
condition = (xf < v1) | (xf > v2)
return masked_where(condition, x, copy=copy)
def masked_object(x, value, copy=True, shrink=True):
"""
Mask the array `x` where the data are exactly equal to value.
This function is similar to `masked_values`, but only suitable
for object arrays: for floating point, use `masked_values` instead.
Parameters
----------
x : array_like
Array to mask
value : object
Comparison value
copy : {True, False}, optional
Whether to return a copy of `x`.
shrink : {True, False}, optional
Whether to collapse a mask full of False to nomask
Returns
-------
result : MaskedArray
The result of masking `x` where equal to `value`.
See Also
--------
masked_where : Mask where a condition is met.
masked_equal : Mask where equal to a given value (integers).
masked_values : Mask using floating point equality.
Examples
--------
>>> import numpy.ma as ma
>>> food = np.array(['green_eggs', 'ham'], dtype=object)
>>> # don't eat spoiled food
>>> eat = ma.masked_object(food, 'green_eggs')
>>> print(eat)
[-- ham]
>>> # plain ol` ham is boring
>>> fresh_food = np.array(['cheese', 'ham', 'pineapple'], dtype=object)
>>> eat = ma.masked_object(fresh_food, 'green_eggs')
>>> print(eat)
[cheese ham pineapple]
Note that `mask` is set to ``nomask`` if possible.
>>> eat
masked_array(data = [cheese ham pineapple],
mask = False,
fill_value=?)
"""
if isMaskedArray(x):
condition = umath.equal(x._data, value)
mask = x._mask
else:
condition = umath.equal(np.asarray(x), value)
mask = nomask
mask = mask_or(mask, make_mask(condition, shrink=shrink))
return masked_array(x, mask=mask, copy=copy, fill_value=value)
def masked_values(x, value, rtol=1e-5, atol=1e-8, copy=True, shrink=True):
"""
Mask using floating point equality.
Return a MaskedArray, masked where the data in array `x` are approximately
equal to `value`, i.e. where the following condition is True
(abs(x - value) <= atol+rtol*abs(value))
The fill_value is set to `value` and the mask is set to ``nomask`` if
possible. For integers, consider using ``masked_equal``.
Parameters
----------
x : array_like
Array to mask.
value : float
Masking value.
rtol : float, optional
Tolerance parameter.
atol : float, optional
Tolerance parameter (1e-8).
copy : bool, optional
Whether to return a copy of `x`.
shrink : bool, optional
Whether to collapse a mask full of False to ``nomask``.
Returns
-------
result : MaskedArray
The result of masking `x` where approximately equal to `value`.
See Also
--------
masked_where : Mask where a condition is met.
masked_equal : Mask where equal to a given value (integers).
Examples
--------
>>> import numpy.ma as ma
>>> x = np.array([1, 1.1, 2, 1.1, 3])
>>> ma.masked_values(x, 1.1)
masked_array(data = [1.0 -- 2.0 -- 3.0],
mask = [False True False True False],
fill_value=1.1)
Note that `mask` is set to ``nomask`` if possible.
>>> ma.masked_values(x, 1.5)
masked_array(data = [ 1. 1.1 2. 1.1 3. ],
mask = False,
fill_value=1.5)
For integers, the fill value will be different in general to the
result of ``masked_equal``.
>>> x = np.arange(5)
>>> x
array([0, 1, 2, 3, 4])
>>> ma.masked_values(x, 2)
masked_array(data = [0 1 -- 3 4],
mask = [False False True False False],
fill_value=2)
>>> ma.masked_equal(x, 2)
masked_array(data = [0 1 -- 3 4],
mask = [False False True False False],
fill_value=999999)
"""
mabs = umath.absolute
xnew = filled(x, value)
if issubclass(xnew.dtype.type, np.floating):
condition = umath.less_equal(
mabs(xnew - value), atol + rtol * mabs(value))
mask = getmask(x)
else:
condition = umath.equal(xnew, value)
mask = nomask
mask = mask_or(mask, make_mask(condition, shrink=shrink), shrink=shrink)
return masked_array(xnew, mask=mask, copy=copy, fill_value=value)
def masked_invalid(a, copy=True):
"""
Mask an array where invalid values occur (NaNs or infs).
This function is a shortcut to ``masked_where``, with
`condition` = ~(np.isfinite(a)). Any pre-existing mask is conserved.
Only applies to arrays with a dtype where NaNs or infs make sense
(i.e. floating point types), but accepts any array_like object.
See Also
--------
masked_where : Mask where a condition is met.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.arange(5, dtype=np.float)
>>> a[2] = np.NaN
>>> a[3] = np.PINF
>>> a
array([ 0., 1., NaN, Inf, 4.])
>>> ma.masked_invalid(a)
masked_array(data = [0.0 1.0 -- -- 4.0],
mask = [False False True True False],
fill_value=1e+20)
"""
a = np.array(a, copy=copy, subok=True)
mask = getattr(a, '_mask', None)
if mask is not None:
condition = ~(np.isfinite(getdata(a)))
if mask is not nomask:
condition |= mask
cls = type(a)
else:
condition = ~(np.isfinite(a))
cls = MaskedArray
result = a.view(cls)
result._mask = condition
return result
###############################################################################
# Printing options #
###############################################################################
class _MaskedPrintOption:
"""
Handle the string used to represent missing data in a masked array.
"""
def __init__(self, display):
"""
Create the masked_print_option object.
"""
self._display = display
self._enabled = True
def display(self):
"""
Display the string to print for masked values.
"""
return self._display
def set_display(self, s):
"""
Set the string to print for masked values.
"""
self._display = s
def enabled(self):
"""
Is the use of the display value enabled?
"""
return self._enabled
def enable(self, shrink=1):
"""
Set the enabling shrink to `shrink`.
"""
self._enabled = shrink
def __str__(self):
return str(self._display)
__repr__ = __str__
# if you single index into a masked location you get this object.
masked_print_option = _MaskedPrintOption('--')
def _recursive_printoption(result, mask, printopt):
"""
Puts printoptions in result where mask is True.
Private function allowing for recursion
"""
names = result.dtype.names
for name in names:
(curdata, curmask) = (result[name], mask[name])
if curdata.dtype.names:
_recursive_printoption(curdata, curmask, printopt)
else:
np.copyto(curdata, printopt, where=curmask)
return
_print_templates = dict(long_std="""\
masked_%(name)s(data =
%(data)s,
%(nlen)s mask =
%(mask)s,
%(nlen)s fill_value = %(fill)s)
""",
short_std="""\
masked_%(name)s(data = %(data)s,
%(nlen)s mask = %(mask)s,
%(nlen)s fill_value = %(fill)s)
""",
long_flx="""\
masked_%(name)s(data =
%(data)s,
%(nlen)s mask =
%(mask)s,
%(nlen)s fill_value = %(fill)s,
%(nlen)s dtype = %(dtype)s)
""",
short_flx="""\
masked_%(name)s(data = %(data)s,
%(nlen)s mask = %(mask)s,
%(nlen)s fill_value = %(fill)s,
%(nlen)s dtype = %(dtype)s)
""")
###############################################################################
# MaskedArray class #
###############################################################################
def _recursive_filled(a, mask, fill_value):
"""
Recursively fill `a` with `fill_value`.
"""
names = a.dtype.names
for name in names:
current = a[name]
if current.dtype.names:
_recursive_filled(current, mask[name], fill_value[name])
else:
np.copyto(current, fill_value[name], where=mask[name])
def flatten_structured_array(a):
"""
Flatten a structured array.
The data type of the output is chosen such that it can represent all of the
(nested) fields.
Parameters
----------
a : structured array
Returns
-------
output : masked array or ndarray
A flattened masked array if the input is a masked array, otherwise a
standard ndarray.
Examples
--------
>>> ndtype = [('a', int), ('b', float)]
>>> a = np.array([(1, 1), (2, 2)], dtype=ndtype)
>>> flatten_structured_array(a)
array([[1., 1.],
[2., 2.]])
"""
def flatten_sequence(iterable):
"""
Flattens a compound of nested iterables.
"""
for elm in iter(iterable):
if hasattr(elm, '__iter__'):
for f in flatten_sequence(elm):
yield f
else:
yield elm
a = np.asanyarray(a)
inishape = a.shape
a = a.ravel()
if isinstance(a, MaskedArray):
out = np.array([tuple(flatten_sequence(d.item())) for d in a._data])
out = out.view(MaskedArray)
out._mask = np.array([tuple(flatten_sequence(d.item()))
for d in getmaskarray(a)])
else:
out = np.array([tuple(flatten_sequence(d.item())) for d in a])
if len(inishape) > 1:
newshape = list(out.shape)
newshape[0] = inishape
out.shape = tuple(flatten_sequence(newshape))
return out
def _arraymethod(funcname, onmask=True):
"""
Return a class method wrapper around a basic array method.
Creates a class method which returns a masked array, where the new
``_data`` array is the output of the corresponding basic method called
on the original ``_data``.
If `onmask` is True, the new mask is the output of the method called
on the initial mask. Otherwise, the new mask is just a reference
to the initial mask.
Parameters
----------
funcname : str
Name of the function to apply on data.
onmask : bool
Whether the mask must be processed also (True) or left
alone (False). Default is True. Make available as `_onmask`
attribute.
Returns
-------
method : instancemethod
Class method wrapper of the specified basic array method.
"""
def wrapped_method(self, *args, **params):
result = getattr(self._data, funcname)(*args, **params)
result = result.view(type(self))
result._update_from(self)
mask = self._mask
if result.ndim:
if not onmask:
result.__setmask__(mask)
elif mask is not nomask:
result.__setmask__(getattr(mask, funcname)(*args, **params))
else:
if mask.ndim and (not mask.dtype.names and mask.all()):
return masked
return result
methdoc = getattr(ndarray, funcname, None) or getattr(np, funcname, None)
if methdoc is not None:
wrapped_method.__doc__ = methdoc.__doc__
wrapped_method.__name__ = funcname
return wrapped_method
class MaskedIterator(object):
"""
Flat iterator object to iterate over masked arrays.
A `MaskedIterator` iterator is returned by ``x.flat`` for any masked array
`x`. It allows iterating over the array as if it were a 1-D array,
either in a for-loop or by calling its `next` method.
Iteration is done in C-contiguous style, with the last index varying the
fastest. The iterator can also be indexed using basic slicing or
advanced indexing.
See Also
--------
MaskedArray.flat : Return a flat iterator over an array.
MaskedArray.flatten : Returns a flattened copy of an array.
Notes
-----
`MaskedIterator` is not exported by the `ma` module. Instead of
instantiating a `MaskedIterator` directly, use `MaskedArray.flat`.
Examples
--------
>>> x = np.ma.array(arange(6).reshape(2, 3))
>>> fl = x.flat
>>> type(fl)
<class 'numpy.ma.core.MaskedIterator'>
>>> for item in fl:
... print(item)
...
0
1
2
3
4
5
Extracting more than a single element b indexing the `MaskedIterator`
returns a masked array:
>>> fl[2:4]
masked_array(data = [2 3],
mask = False,
fill_value = 999999)
"""
def __init__(self, ma):
self.ma = ma
self.dataiter = ma._data.flat
if ma._mask is nomask:
self.maskiter = None
else:
self.maskiter = ma._mask.flat
def __iter__(self):
return self
def __getitem__(self, indx):
result = self.dataiter.__getitem__(indx).view(type(self.ma))
if self.maskiter is not None:
_mask = self.maskiter.__getitem__(indx)
if isinstance(_mask, ndarray):
# set shape to match that of data; this is needed for matrices
_mask.shape = result.shape
result._mask = _mask
elif isinstance(_mask, np.void):
return mvoid(result, mask=_mask, hardmask=self.ma._hardmask)
elif _mask: # Just a scalar, masked
return masked
return result
# This won't work if ravel makes a copy
def __setitem__(self, index, value):
self.dataiter[index] = getdata(value)
if self.maskiter is not None:
self.maskiter[index] = getmaskarray(value)
def __next__(self):
"""
Return the next value, or raise StopIteration.
Examples
--------
>>> x = np.ma.array([3, 2], mask=[0, 1])
>>> fl = x.flat
>>> fl.next()
3
>>> fl.next()
masked_array(data = --,
mask = True,
fill_value = 1e+20)
>>> fl.next()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/ralf/python/numpy/numpy/ma/core.py", line 2243, in next
d = self.dataiter.next()
StopIteration
"""
d = next(self.dataiter)
if self.maskiter is not None:
m = next(self.maskiter)
if isinstance(m, np.void):
return mvoid(d, mask=m, hardmask=self.ma._hardmask)
elif m: # Just a scalar, masked
return masked
return d
next = __next__
class MaskedArray(ndarray):
"""
An array class with possibly masked values.
Masked values of True exclude the corresponding element from any
computation.
Construction::
x = MaskedArray(data, mask=nomask, dtype=None, copy=False, subok=True,
ndmin=0, fill_value=None, keep_mask=True, hard_mask=None,
shrink=True, order=None)
Parameters
----------
data : array_like
Input data.
mask : sequence, optional
Mask. Must be convertible to an array of booleans with the same
shape as `data`. True indicates a masked (i.e. invalid) data.
dtype : dtype, optional
Data type of the output.
If `dtype` is None, the type of the data argument (``data.dtype``)
is used. If `dtype` is not None and different from ``data.dtype``,
a copy is performed.
copy : bool, optional
Whether to copy the input data (True), or to use a reference instead.
Default is False.
subok : bool, optional
Whether to return a subclass of `MaskedArray` if possible (True) or a
plain `MaskedArray`. Default is True.
ndmin : int, optional
Minimum number of dimensions. Default is 0.
fill_value : scalar, optional
Value used to fill in the masked values when necessary.
If None, a default based on the data-type is used.
keep_mask : bool, optional
Whether to combine `mask` with the mask of the input data, if any
(True), or to use only `mask` for the output (False). Default is True.
hard_mask : bool, optional
Whether to use a hard mask or not. With a hard mask, masked values
cannot be unmasked. Default is False.
shrink : bool, optional
Whether to force compression of an empty mask. Default is True.
order : {'C', 'F', 'A'}, optional
Specify the order of the array. If order is 'C', then the array
will be in C-contiguous order (last-index varies the fastest).
If order is 'F', then the returned array will be in
Fortran-contiguous order (first-index varies the fastest).
If order is 'A' (default), then the returned array may be
in any order (either C-, Fortran-contiguous, or even discontiguous),
unless a copy is required, in which case it will be C-contiguous.
"""
__array_priority__ = 15
_defaultmask = nomask
_defaulthardmask = False
_baseclass = ndarray
# Maximum number of elements per axis used when printing an array. The
# 1d case is handled separately because we need more values in this case.
_print_width = 100
_print_width_1d = 1500
def __new__(cls, data=None, mask=nomask, dtype=None, copy=False,
subok=True, ndmin=0, fill_value=None, keep_mask=True,
hard_mask=None, shrink=True, order=None, **options):
"""
Create a new masked array from scratch.
Notes
-----
A masked array can also be created by taking a .view(MaskedArray).
"""
# Process data.
_data = np.array(data, dtype=dtype, copy=copy,
order=order, subok=True, ndmin=ndmin)
_baseclass = getattr(data, '_baseclass', type(_data))
# Check that we're not erasing the mask.
if isinstance(data, MaskedArray) and (data.shape != _data.shape):
copy = True
# Here, we copy the _view_, so that we can attach new properties to it
# we must never do .view(MaskedConstant), as that would create a new
# instance of np.ma.masked, which make identity comparison fail
if isinstance(data, cls) and subok and not isinstance(data, MaskedConstant):
_data = ndarray.view(_data, type(data))
else:
_data = ndarray.view(_data, cls)
# Backwards compatibility w/ numpy.core.ma.
if hasattr(data, '_mask') and not isinstance(data, ndarray):
_data._mask = data._mask
# FIXME _sharedmask is never used.
_sharedmask = True
# Process mask.
# Number of named fields (or zero if none)
names_ = _data.dtype.names or ()
# Type of the mask
if names_:
mdtype = make_mask_descr(_data.dtype)
else:
mdtype = MaskType
if mask is nomask:
# Case 1. : no mask in input.
# Erase the current mask ?
if not keep_mask:
# With a reduced version
if shrink:
_data._mask = nomask
# With full version
else:
_data._mask = np.zeros(_data.shape, dtype=mdtype)
# Check whether we missed something
elif isinstance(data, (tuple, list)):
try:
# If data is a sequence of masked array
mask = np.array([getmaskarray(m) for m in data],
dtype=mdtype)
except ValueError:
# If data is nested
mask = nomask
# Force shrinking of the mask if needed (and possible)
if (mdtype == MaskType) and mask.any():
_data._mask = mask
_data._sharedmask = False
else:
if copy:
_data._mask = _data._mask.copy()
_data._sharedmask = False
# Reset the shape of the original mask
if getmask(data) is not nomask:
data._mask.shape = data.shape
else:
_data._sharedmask = True
else:
# Case 2. : With a mask in input.
# If mask is boolean, create an array of True or False
if mask is True and mdtype == MaskType:
mask = np.ones(_data.shape, dtype=mdtype)
elif mask is False and mdtype == MaskType:
mask = np.zeros(_data.shape, dtype=mdtype)
else:
# Read the mask with the current mdtype
try:
mask = np.array(mask, copy=copy, dtype=mdtype)
# Or assume it's a sequence of bool/int
except TypeError:
mask = np.array([tuple([m] * len(mdtype)) for m in mask],
dtype=mdtype)
# Make sure the mask and the data have the same shape
if mask.shape != _data.shape:
(nd, nm) = (_data.size, mask.size)
if nm == 1:
mask = np.resize(mask, _data.shape)
elif nm == nd:
mask = np.reshape(mask, _data.shape)
else:
msg = "Mask and data not compatible: data size is %i, " + \
"mask size is %i."
raise MaskError(msg % (nd, nm))
copy = True
# Set the mask to the new value
if _data._mask is nomask:
_data._mask = mask
_data._sharedmask = not copy
else:
if not keep_mask:
_data._mask = mask
_data._sharedmask = not copy
else:
if names_:
def _recursive_or(a, b):
"do a|=b on each field of a, recursively"
for name in a.dtype.names:
(af, bf) = (a[name], b[name])
if af.dtype.names:
_recursive_or(af, bf)
else:
af |= bf
return
_recursive_or(_data._mask, mask)
else:
_data._mask = np.logical_or(mask, _data._mask)
_data._sharedmask = False
# Update fill_value.
if fill_value is None:
fill_value = getattr(data, '_fill_value', None)
# But don't run the check unless we have something to check.
if fill_value is not None:
_data._fill_value = _check_fill_value(fill_value, _data.dtype)
# Process extra options ..
if hard_mask is None:
_data._hardmask = getattr(data, '_hardmask', False)
else:
_data._hardmask = hard_mask
_data._baseclass = _baseclass
return _data
def _update_from(self, obj):
"""
Copies some attributes of obj to self.
"""
if obj is not None and isinstance(obj, ndarray):
_baseclass = type(obj)
else:
_baseclass = ndarray
# We need to copy the _basedict to avoid backward propagation
_optinfo = {}
_optinfo.update(getattr(obj, '_optinfo', {}))
_optinfo.update(getattr(obj, '_basedict', {}))
if not isinstance(obj, MaskedArray):
_optinfo.update(getattr(obj, '__dict__', {}))
_dict = dict(_fill_value=getattr(obj, '_fill_value', None),
_hardmask=getattr(obj, '_hardmask', False),
_sharedmask=getattr(obj, '_sharedmask', False),
_isfield=getattr(obj, '_isfield', False),
_baseclass=getattr(obj, '_baseclass', _baseclass),
_optinfo=_optinfo,
_basedict=_optinfo)
self.__dict__.update(_dict)
self.__dict__.update(_optinfo)
return
def __array_finalize__(self, obj):
"""
Finalizes the masked array.
"""
# Get main attributes.
self._update_from(obj)
# We have to decide how to initialize self.mask, based on
# obj.mask. This is very difficult. There might be some
# correspondence between the elements in the array we are being
# created from (= obj) and us. Or there might not. This method can
# be called in all kinds of places for all kinds of reasons -- could
# be empty_like, could be slicing, could be a ufunc, could be a view.
# The numpy subclassing interface simply doesn't give us any way
# to know, which means that at best this method will be based on
# guesswork and heuristics. To make things worse, there isn't even any
# clear consensus about what the desired behavior is. For instance,
# most users think that np.empty_like(marr) -- which goes via this
# method -- should return a masked array with an empty mask (see
# gh-3404 and linked discussions), but others disagree, and they have
# existing code which depends on empty_like returning an array that
# matches the input mask.
#
# Historically our algorithm was: if the template object mask had the
# same *number of elements* as us, then we used *it's mask object
# itself* as our mask, so that writes to us would also write to the
# original array. This is horribly broken in multiple ways.
#
# Now what we do instead is, if the template object mask has the same
# number of elements as us, and we do not have the same base pointer
# as the template object (b/c views like arr[...] should keep the same
# mask), then we make a copy of the template object mask and use
# that. This is also horribly broken but somewhat less so. Maybe.
if isinstance(obj, ndarray):
# XX: This looks like a bug -- shouldn't it check self.dtype
# instead?
if obj.dtype.names:
_mask = getmaskarray(obj)
else:
_mask = getmask(obj)
# If self and obj point to exactly the same data, then probably
# self is a simple view of obj (e.g., self = obj[...]), so they
# should share the same mask. (This isn't 100% reliable, e.g. self
# could be the first row of obj, or have strange strides, but as a
# heuristic it's not bad.) In all other cases, we make a copy of
# the mask, so that future modifications to 'self' do not end up
# side-effecting 'obj' as well.
if (obj.__array_interface__["data"][0]
!= self.__array_interface__["data"][0]):
_mask = _mask.copy()
else:
_mask = nomask
self._mask = _mask
# Finalize the mask
if self._mask is not nomask:
try:
self._mask.shape = self.shape
except ValueError:
self._mask = nomask
except (TypeError, AttributeError):
# When _mask.shape is not writable (because it's a void)
pass
# Finalize the fill_value for structured arrays
if self.dtype.names:
if self._fill_value is None:
self._fill_value = _check_fill_value(None, self.dtype)
return
def __array_wrap__(self, obj, context=None):
"""
Special hook for ufuncs.
Wraps the numpy array and sets the mask according to context.
"""
if obj is self: # for in-place operations
result = obj
else:
result = obj.view(type(self))
result._update_from(self)
if context is not None:
result._mask = result._mask.copy()
(func, args, _) = context
m = reduce(mask_or, [getmaskarray(arg) for arg in args])
# Get the domain mask
domain = ufunc_domain.get(func, None)
if domain is not None:
# Take the domain, and make sure it's a ndarray
if len(args) > 2:
with np.errstate(divide='ignore', invalid='ignore'):
d = filled(reduce(domain, args), True)
else:
with np.errstate(divide='ignore', invalid='ignore'):
d = filled(domain(*args), True)
if d.any():
# Fill the result where the domain is wrong
try:
# Binary domain: take the last value
fill_value = ufunc_fills[func][-1]
except TypeError:
# Unary domain: just use this one
fill_value = ufunc_fills[func]
except KeyError:
# Domain not recognized, use fill_value instead
fill_value = self.fill_value
np.copyto(result, fill_value, where=d)
# Update the mask
if m is nomask:
m = d
else:
# Don't modify inplace, we risk back-propagation
m = (m | d)
# Make sure the mask has the proper size
if result is not self and result.shape == () and m:
return masked
else:
result._mask = m
result._sharedmask = False
return result
def view(self, dtype=None, type=None, fill_value=None):
"""
Return a view of the MaskedArray data
Parameters
----------
dtype : data-type or ndarray sub-class, optional
Data-type descriptor of the returned view, e.g., float32 or int16.
The default, None, results in the view having the same data-type
as `a`. As with ``ndarray.view``, dtype can also be specified as
an ndarray sub-class, which then specifies the type of the
returned object (this is equivalent to setting the ``type``
parameter).
type : Python type, optional
Type of the returned view, e.g., ndarray or matrix. Again, the
default None results in type preservation.
Notes
-----
``a.view()`` is used two different ways:
``a.view(some_dtype)`` or ``a.view(dtype=some_dtype)`` constructs a view
of the array's memory with a different data-type. This can cause a
reinterpretation of the bytes of memory.
``a.view(ndarray_subclass)`` or ``a.view(type=ndarray_subclass)`` just
returns an instance of `ndarray_subclass` that looks at the same array
(same shape, dtype, etc.) This does not cause a reinterpretation of the
memory.
If `fill_value` is not specified, but `dtype` is specified (and is not
an ndarray sub-class), the `fill_value` of the MaskedArray will be
reset. If neither `fill_value` nor `dtype` are specified (or if
`dtype` is an ndarray sub-class), then the fill value is preserved.
Finally, if `fill_value` is specified, but `dtype` is not, the fill
value is set to the specified value.
For ``a.view(some_dtype)``, if ``some_dtype`` has a different number of
bytes per entry than the previous dtype (for example, converting a
regular array to a structured array), then the behavior of the view
cannot be predicted just from the superficial appearance of ``a`` (shown
by ``print(a)``). It also depends on exactly how ``a`` is stored in
memory. Therefore if ``a`` is C-ordered versus fortran-ordered, versus
defined as a slice or transpose, etc., the view may give different
results.
"""
if dtype is None:
if type is None:
output = ndarray.view(self)
else:
output = ndarray.view(self, type)
elif type is None:
try:
if issubclass(dtype, ndarray):
output = ndarray.view(self, dtype)
dtype = None
else:
output = ndarray.view(self, dtype)
except TypeError:
output = ndarray.view(self, dtype)
else:
output = ndarray.view(self, dtype, type)
# also make the mask be a view (so attr changes to the view's
# mask do no affect original object's mask)
# (especially important to avoid affecting np.masked singleton)
if (getmask(output) is not nomask):
output._mask = output._mask.view()
# Make sure to reset the _fill_value if needed
if getattr(output, '_fill_value', None) is not None:
if fill_value is None:
if dtype is None:
pass # leave _fill_value as is
else:
output._fill_value = None
else:
output.fill_value = fill_value
return output
view.__doc__ = ndarray.view.__doc__
def astype(self, newtype):
"""
Returns a copy of the MaskedArray cast to given newtype.
Returns
-------
output : MaskedArray
A copy of self cast to input newtype.
The returned record shape matches self.shape.
Examples
--------
>>> x = np.ma.array([[1,2,3.1],[4,5,6],[7,8,9]], mask=[0] + [1,0]*4)
>>> print(x)
[[1.0 -- 3.1]
[-- 5.0 --]
[7.0 -- 9.0]]
>>> print(x.astype(int32))
[[1 -- 3]
[-- 5 --]
[7 -- 9]]
"""
newtype = np.dtype(newtype)
output = self._data.astype(newtype).view(type(self))
output._update_from(self)
names = output.dtype.names
if names is None:
output._mask = self._mask.astype(bool)
else:
if self._mask is nomask:
output._mask = nomask
else:
output._mask = self._mask.astype([(n, bool) for n in names])
# Don't check _fill_value if it's None, that'll speed things up
if self._fill_value is not None:
output._fill_value = _check_fill_value(self._fill_value, newtype)
return output
def __getitem__(self, indx):
"""
x.__getitem__(y) <==> x[y]
Return the item described by i, as a masked array.
"""
# We could directly use ndarray.__getitem__ on self.
# But then we would have to modify __array_finalize__ to prevent the
# mask of being reshaped if it hasn't been set up properly yet
# So it's easier to stick to the current version
dout = self.data[indx]
_mask = self._mask
def _is_scalar(m):
return not isinstance(m, np.ndarray)
def _scalar_heuristic(arr, elem):
"""
Return whether `elem` is a scalar result of indexing `arr`, or None
if undecidable without promoting nomask to a full mask
"""
# obviously a scalar
if not isinstance(elem, np.ndarray):
return True
# object array scalar indexing can return anything
elif arr.dtype.type is np.object_:
if arr.dtype is not elem.dtype:
# elem is an array, but dtypes do not match, so must be
# an element
return True
# well-behaved subclass that only returns 0d arrays when
# expected - this is not a scalar
elif type(arr).__getitem__ == ndarray.__getitem__:
return False
return None
if _mask is not nomask:
# _mask cannot be a subclass, so it tells us whether we should
# expect a scalar. It also cannot be of dtype object.
mout = _mask[indx]
scalar_expected = _is_scalar(mout)
else:
# attempt to apply the heuristic to avoid constructing a full mask
mout = nomask
scalar_expected = _scalar_heuristic(self.data, dout)
if scalar_expected is None:
# heuristics have failed
# construct a full array, so we can be certain. This is costly.
# we could also fall back on ndarray.__getitem__(self.data, indx)
scalar_expected = _is_scalar(getmaskarray(self)[indx])
# Did we extract a single item?
if scalar_expected:
# A record
if isinstance(dout, np.void):
# We should always re-cast to mvoid, otherwise users can
# change masks on rows that already have masked values, but not
# on rows that have no masked values, which is inconsistent.
return mvoid(dout, mask=mout, hardmask=self._hardmask)
# special case introduced in gh-5962
elif (self.dtype.type is np.object_ and
isinstance(dout, np.ndarray) and
dout is not masked):
# If masked, turn into a MaskedArray, with everything masked.
if mout:
return MaskedArray(dout, mask=True)
else:
return dout
# Just a scalar
else:
if mout:
return masked
else:
return dout
else:
# Force dout to MA
dout = dout.view(type(self))
# Inherit attributes from self
dout._update_from(self)
# Check the fill_value
if isinstance(indx, basestring):
if self._fill_value is not None:
dout._fill_value = self._fill_value[indx]
# If we're indexing a multidimensional field in a
# structured array (such as dtype("(2,)i2,(2,)i1")),
# dimensionality goes up (M[field].ndim == M.ndim +
# M.dtype[field].ndim). That's fine for
# M[field] but problematic for M[field].fill_value
# which should have shape () to avoid breaking several
# methods. There is no great way out, so set to
# first element. See issue #6723.
if dout._fill_value.ndim > 0:
if not (dout._fill_value ==
dout._fill_value.flat[0]).all():
warnings.warn(
"Upon accessing multidimensional field "
"{indx:s}, need to keep dimensionality "
"of fill_value at 0. Discarding "
"heterogeneous fill_value and setting "
"all to {fv!s}.".format(indx=indx,
fv=dout._fill_value[0]),
stacklevel=2)
dout._fill_value = dout._fill_value.flat[0]
dout._isfield = True
# Update the mask if needed
if mout is not nomask:
# set shape to match that of data; this is needed for matrices
dout._mask = reshape(mout, dout.shape)
dout._sharedmask = True
# Note: Don't try to check for m.any(), that'll take too long
return dout
def __setitem__(self, indx, value):
"""
x.__setitem__(i, y) <==> x[i]=y
Set item described by index. If value is masked, masks those
locations.
"""
if self is masked:
raise MaskError('Cannot alter the masked element.')
_data = self._data
_mask = self._mask
if isinstance(indx, basestring):
_data[indx] = value
if _mask is nomask:
self._mask = _mask = make_mask_none(self.shape, self.dtype)
_mask[indx] = getmask(value)
return
_dtype = _data.dtype
nbfields = len(_dtype.names or ())
if value is masked:
# The mask wasn't set: create a full version.
if _mask is nomask:
_mask = self._mask = make_mask_none(self.shape, _dtype)
# Now, set the mask to its value.
if nbfields:
_mask[indx] = tuple([True] * nbfields)
else:
_mask[indx] = True
if not self._isfield:
self._sharedmask = False
return
# Get the _data part of the new value
dval = getattr(value, '_data', value)
# Get the _mask part of the new value
mval = getmask(value)
if nbfields and mval is nomask:
mval = tuple([False] * nbfields)
if _mask is nomask:
# Set the data, then the mask
_data[indx] = dval
if mval is not nomask:
_mask = self._mask = make_mask_none(self.shape, _dtype)
_mask[indx] = mval
elif not self._hardmask:
# Unshare the mask if necessary to avoid propagation
# We want to remove the unshare logic from this place in the
# future. Note that _sharedmask has lots of false positives.
if not self._isfield:
notthree = getattr(sys, 'getrefcount', False) and (sys.getrefcount(_mask) != 3)
if self._sharedmask and not (
# If no one else holds a reference (we have two
# references (_mask and self._mask) -- add one for
# getrefcount) and the array owns its own data
# copying the mask should do nothing.
(not notthree) and _mask.flags.owndata):
# 2016.01.15 -- v1.11.0
warnings.warn(
"setting an item on a masked array which has a shared "
"mask will not copy the mask and also change the "
"original mask array in the future.\n"
"Check the NumPy 1.11 release notes for more "
"information.",
MaskedArrayFutureWarning, stacklevel=2)
self.unshare_mask()
_mask = self._mask
# Set the data, then the mask
_data[indx] = dval
_mask[indx] = mval
elif hasattr(indx, 'dtype') and (indx.dtype == MaskType):
indx = indx * umath.logical_not(_mask)
_data[indx] = dval
else:
if nbfields:
err_msg = "Flexible 'hard' masks are not yet supported."
raise NotImplementedError(err_msg)
mindx = mask_or(_mask[indx], mval, copy=True)
dindx = self._data[indx]
if dindx.size > 1:
np.copyto(dindx, dval, where=~mindx)
elif mindx is nomask:
dindx = dval
_data[indx] = dindx
_mask[indx] = mindx
return
def __setattr__(self, attr, value):
super(MaskedArray, self).__setattr__(attr, value)
if attr == 'dtype' and self._mask is not nomask:
self._mask = self._mask.view(make_mask_descr(value), ndarray)
# Try to reset the shape of the mask (if we don't have a void)
# This raises a ValueError if the dtype change won't work
try:
self._mask.shape = self.shape
except (AttributeError, TypeError):
pass
def __setmask__(self, mask, copy=False):
"""
Set the mask.
"""
idtype = self.dtype
current_mask = self._mask
if mask is masked:
mask = True
if (current_mask is nomask):
# Make sure the mask is set
# Just don't do anything if there's nothing to do.
if mask is nomask:
return
current_mask = self._mask = make_mask_none(self.shape, idtype)
if idtype.names is None:
# No named fields.
# Hardmask: don't unmask the data
if self._hardmask:
current_mask |= mask
# Softmask: set everything to False
# If it's obviously a compatible scalar, use a quick update
# method.
elif isinstance(mask, (int, float, np.bool_, np.number)):
current_mask[...] = mask
# Otherwise fall back to the slower, general purpose way.
else:
current_mask.flat = mask
else:
# Named fields w/
mdtype = current_mask.dtype
mask = np.array(mask, copy=False)
# Mask is a singleton
if not mask.ndim:
# It's a boolean : make a record
if mask.dtype.kind == 'b':
mask = np.array(tuple([mask.item()] * len(mdtype)),
dtype=mdtype)
# It's a record: make sure the dtype is correct
else:
mask = mask.astype(mdtype)
# Mask is a sequence
else:
# Make sure the new mask is a ndarray with the proper dtype
try:
mask = np.array(mask, copy=copy, dtype=mdtype)
# Or assume it's a sequence of bool/int
except TypeError:
mask = np.array([tuple([m] * len(mdtype)) for m in mask],
dtype=mdtype)
# Hardmask: don't unmask the data
if self._hardmask:
for n in idtype.names:
current_mask[n] |= mask[n]
# Softmask: set everything to False
# If it's obviously a compatible scalar, use a quick update
# method.
elif isinstance(mask, (int, float, np.bool_, np.number)):
current_mask[...] = mask
# Otherwise fall back to the slower, general purpose way.
else:
current_mask.flat = mask
# Reshape if needed
if current_mask.shape:
current_mask.shape = self.shape
return
_set_mask = __setmask__
def _get_mask(self):
"""Return the current mask.
"""
# We could try to force a reshape, but that wouldn't work in some
# cases.
return self._mask
mask = property(fget=_get_mask, fset=__setmask__, doc="Mask")
def _get_recordmask(self):
"""
Return the mask of the records.
A record is masked when all the fields are masked.
"""
_mask = self._mask.view(ndarray)
if _mask.dtype.names is None:
return _mask
return np.all(flatten_structured_array(_mask), axis=-1)
def _set_recordmask(self):
"""
Return the mask of the records.
A record is masked when all the fields are masked.
"""
raise NotImplementedError("Coming soon: setting the mask per records!")
recordmask = property(fget=_get_recordmask)
def harden_mask(self):
"""
Force the mask to hard.
Whether the mask of a masked array is hard or soft is determined by
its `hardmask` property. `harden_mask` sets `hardmask` to True.
See Also
--------
hardmask
"""
self._hardmask = True
return self
def soften_mask(self):
"""
Force the mask to soft.
Whether the mask of a masked array is hard or soft is determined by
its `hardmask` property. `soften_mask` sets `hardmask` to False.
See Also
--------
hardmask
"""
self._hardmask = False
return self
hardmask = property(fget=lambda self: self._hardmask,
doc="Hardness of the mask")
def unshare_mask(self):
"""
Copy the mask and set the sharedmask flag to False.
Whether the mask is shared between masked arrays can be seen from
the `sharedmask` property. `unshare_mask` ensures the mask is not shared.
A copy of the mask is only made if it was shared.
See Also
--------
sharedmask
"""
if self._sharedmask:
self._mask = self._mask.copy()
self._sharedmask = False
return self
sharedmask = property(fget=lambda self: self._sharedmask,
doc="Share status of the mask (read-only).")
def shrink_mask(self):
"""
Reduce a mask to nomask when possible.
Parameters
----------
None
Returns
-------
None
Examples
--------
>>> x = np.ma.array([[1,2 ], [3, 4]], mask=[0]*4)
>>> x.mask
array([[False, False],
[False, False]], dtype=bool)
>>> x.shrink_mask()
>>> x.mask
False
"""
m = self._mask
if m.ndim and not m.any():
self._mask = nomask
return self
baseclass = property(fget=lambda self: self._baseclass,
doc="Class of the underlying data (read-only).")
def _get_data(self):
"""Return the current data, as a view of the original
underlying data.
"""
return ndarray.view(self, self._baseclass)
_data = property(fget=_get_data)
data = property(fget=_get_data)
def _get_flat(self):
"Return a flat iterator."
return MaskedIterator(self)
def _set_flat(self, value):
"Set a flattened version of self to value."
y = self.ravel()
y[:] = value
flat = property(fget=_get_flat, fset=_set_flat,
doc="Flat version of the array.")
def get_fill_value(self):
"""
Return the filling value of the masked array.
Returns
-------
fill_value : scalar
The filling value.
Examples
--------
>>> for dt in [np.int32, np.int64, np.float64, np.complex128]:
... np.ma.array([0, 1], dtype=dt).get_fill_value()
...
999999
999999
1e+20
(1e+20+0j)
>>> x = np.ma.array([0, 1.], fill_value=-np.inf)
>>> x.get_fill_value()
-inf
"""
if self._fill_value is None:
self._fill_value = _check_fill_value(None, self.dtype)
# Temporary workaround to account for the fact that str and bytes
# scalars cannot be indexed with (), whereas all other numpy
# scalars can. See issues #7259 and #7267.
# The if-block can be removed after #7267 has been fixed.
if isinstance(self._fill_value, ndarray):
return self._fill_value[()]
return self._fill_value
def set_fill_value(self, value=None):
"""
Set the filling value of the masked array.
Parameters
----------
value : scalar, optional
The new filling value. Default is None, in which case a default
based on the data type is used.
See Also
--------
ma.set_fill_value : Equivalent function.
Examples
--------
>>> x = np.ma.array([0, 1.], fill_value=-np.inf)
>>> x.fill_value
-inf
>>> x.set_fill_value(np.pi)
>>> x.fill_value
3.1415926535897931
Reset to default:
>>> x.set_fill_value()
>>> x.fill_value
1e+20
"""
target = _check_fill_value(value, self.dtype)
_fill_value = self._fill_value
if _fill_value is None:
# Create the attribute if it was undefined
self._fill_value = target
else:
# Don't overwrite the attribute, just fill it (for propagation)
_fill_value[()] = target
fill_value = property(fget=get_fill_value, fset=set_fill_value,
doc="Filling value.")
def filled(self, fill_value=None):
"""
Return a copy of self, with masked values filled with a given value.
**However**, if there are no masked values to fill, self will be
returned instead as an ndarray.
Parameters
----------
fill_value : scalar, optional
The value to use for invalid entries (None by default).
If None, the `fill_value` attribute of the array is used instead.
Returns
-------
filled_array : ndarray
A copy of ``self`` with invalid entries replaced by *fill_value*
(be it the function argument or the attribute of ``self``), or
``self`` itself as an ndarray if there are no invalid entries to
be replaced.
Notes
-----
The result is **not** a MaskedArray!
Examples
--------
>>> x = np.ma.array([1,2,3,4,5], mask=[0,0,1,0,1], fill_value=-999)
>>> x.filled()
array([1, 2, -999, 4, -999])
>>> type(x.filled())
<type 'numpy.ndarray'>
Subclassing is preserved. This means that if the data part of the masked
array is a matrix, `filled` returns a matrix:
>>> x = np.ma.array(np.matrix([[1, 2], [3, 4]]), mask=[[0, 1], [1, 0]])
>>> x.filled()
matrix([[ 1, 999999],
[999999, 4]])
"""
m = self._mask
if m is nomask:
return self._data
if fill_value is None:
fill_value = self.fill_value
else:
fill_value = _check_fill_value(fill_value, self.dtype)
if self is masked_singleton:
return np.asanyarray(fill_value)
if m.dtype.names:
result = self._data.copy('K')
_recursive_filled(result, self._mask, fill_value)
elif not m.any():
return self._data
else:
result = self._data.copy('K')
try:
np.copyto(result, fill_value, where=m)
except (TypeError, AttributeError):
fill_value = narray(fill_value, dtype=object)
d = result.astype(object)
result = np.choose(m, (d, fill_value))
except IndexError:
# ok, if scalar
if self._data.shape:
raise
elif m:
result = np.array(fill_value, dtype=self.dtype)
else:
result = self._data
return result
def compressed(self):
"""
Return all the non-masked data as a 1-D array.
Returns
-------
data : ndarray
A new `ndarray` holding the non-masked data is returned.
Notes
-----
The result is **not** a MaskedArray!
Examples
--------
>>> x = np.ma.array(np.arange(5), mask=[0]*2 + [1]*3)
>>> x.compressed()
array([0, 1])
>>> type(x.compressed())
<type 'numpy.ndarray'>
"""
data = ndarray.ravel(self._data)
if self._mask is not nomask:
data = data.compress(np.logical_not(ndarray.ravel(self._mask)))
return data
def compress(self, condition, axis=None, out=None):
"""
Return `a` where condition is ``True``.
If condition is a `MaskedArray`, missing values are considered
as ``False``.
Parameters
----------
condition : var
Boolean 1-d array selecting which entries to return. If len(condition)
is less than the size of a along the axis, then output is truncated
to length of condition array.
axis : {None, int}, optional
Axis along which the operation must be performed.
out : {None, ndarray}, optional
Alternative output array in which to place the result. It must have
the same shape as the expected output but the type will be cast if
necessary.
Returns
-------
result : MaskedArray
A :class:`MaskedArray` object.
Notes
-----
Please note the difference with :meth:`compressed` !
The output of :meth:`compress` has a mask, the output of
:meth:`compressed` does not.
Examples
--------
>>> x = np.ma.array([[1,2,3],[4,5,6],[7,8,9]], mask=[0] + [1,0]*4)
>>> print(x)
[[1 -- 3]
[-- 5 --]
[7 -- 9]]
>>> x.compress([1, 0, 1])
masked_array(data = [1 3],
mask = [False False],
fill_value=999999)
>>> x.compress([1, 0, 1], axis=1)
masked_array(data =
[[1 3]
[-- --]
[7 9]],
mask =
[[False False]
[ True True]
[False False]],
fill_value=999999)
"""
# Get the basic components
(_data, _mask) = (self._data, self._mask)
# Force the condition to a regular ndarray and forget the missing
# values.
condition = np.array(condition, copy=False, subok=False)
_new = _data.compress(condition, axis=axis, out=out).view(type(self))
_new._update_from(self)
if _mask is not nomask:
_new._mask = _mask.compress(condition, axis=axis)
return _new
def __str__(self):
"""
String representation.
"""
if masked_print_option.enabled():
f = masked_print_option
if self is masked:
return str(f)
m = self._mask
if m is nomask:
res = self._data
else:
if m.shape == () and m.itemsize==len(m.dtype):
if m.dtype.names:
m = m.view((bool, len(m.dtype)))
if m.any():
return str(tuple((f if _m else _d) for _d, _m in
zip(self._data.tolist(), m)))
else:
return str(self._data)
elif m:
return str(f)
else:
return str(self._data)
# convert to object array to make filled work
names = self.dtype.names
if names is None:
data = self._data
mask = m
# For big arrays, to avoid a costly conversion to the
# object dtype, extract the corners before the conversion.
print_width = (self._print_width if self.ndim > 1
else self._print_width_1d)
for axis in range(self.ndim):
if data.shape[axis] > print_width:
ind = print_width // 2
arr = np.split(data, (ind, -ind), axis=axis)
data = np.concatenate((arr[0], arr[2]), axis=axis)
arr = np.split(mask, (ind, -ind), axis=axis)
mask = np.concatenate((arr[0], arr[2]), axis=axis)
res = data.astype("O")
res.view(ndarray)[mask] = f
else:
rdtype = _replace_dtype_fields(self.dtype, "O")
res = self._data.astype(rdtype)
_recursive_printoption(res, m, f)
else:
res = self.filled(self.fill_value)
return str(res)
def __repr__(self):
"""
Literal string representation.
"""
n = self.ndim
if self._baseclass is np.ndarray:
name = 'array'
else:
name = self._baseclass.__name__
parameters = dict(name=name, nlen=" " * len(name),
data=str(self), mask=str(self._mask),
fill=str(self.fill_value), dtype=str(self.dtype))
if self.dtype.names:
if n <= 1:
return _print_templates['short_flx'] % parameters
return _print_templates['long_flx'] % parameters
elif n <= 1:
return _print_templates['short_std'] % parameters
return _print_templates['long_std'] % parameters
def _delegate_binop(self, other):
# This emulates the logic in
# private/binop_override.h:forward_binop_should_defer
if isinstance(other, type(self)):
return False
array_ufunc = getattr(other, "__array_ufunc__", False)
if array_ufunc is False:
other_priority = getattr(other, "__array_priority__", -1000000)
return self.__array_priority__ < other_priority
else:
# If array_ufunc is not None, it will be called inside the ufunc;
# None explicitly tells us to not call the ufunc, i.e., defer.
return array_ufunc is None
def _comparison(self, other, compare):
"""Compare self with other using operator.eq or operator.ne.
When either of the elements is masked, the result is masked as well,
but the underlying boolean data are still set, with self and other
considered equal if both are masked, and unequal otherwise.
For structured arrays, all fields are combined, with masked values
ignored. The result is masked if all fields were masked, with self
and other considered equal only if both were fully masked.
"""
omask = getmask(other)
smask = self.mask
mask = mask_or(smask, omask, copy=True)
odata = getdata(other)
if mask.dtype.names:
# For possibly masked structured arrays we need to be careful,
# since the standard structured array comparison will use all
# fields, masked or not. To avoid masked fields influencing the
# outcome, we set all masked fields in self to other, so they'll
# count as equal. To prepare, we ensure we have the right shape.
broadcast_shape = np.broadcast(self, odata).shape
sbroadcast = np.broadcast_to(self, broadcast_shape, subok=True)
sbroadcast._mask = mask
sdata = sbroadcast.filled(odata)
# Now take care of the mask; the merged mask should have an item
# masked if all fields were masked (in one and/or other).
mask = (mask == np.ones((), mask.dtype))
else:
# For regular arrays, just use the data as they come.
sdata = self.data
check = compare(sdata, odata)
if isinstance(check, (np.bool_, bool)):
return masked if mask else check
if mask is not nomask:
# Adjust elements that were masked, which should be treated
# as equal if masked in both, unequal if masked in one.
# Note that this works automatically for structured arrays too.
check = np.where(mask, compare(smask, omask), check)
if mask.shape != check.shape:
# Guarantee consistency of the shape, making a copy since the
# the mask may need to get written to later.
mask = np.broadcast_to(mask, check.shape).copy()
check = check.view(type(self))
check._mask = mask
return check
def __eq__(self, other):
"""Check whether other equals self elementwise.
When either of the elements is masked, the result is masked as well,
but the underlying boolean data are still set, with self and other
considered equal if both are masked, and unequal otherwise.
For structured arrays, all fields are combined, with masked values
ignored. The result is masked if all fields were masked, with self
and other considered equal only if both were fully masked.
"""
return self._comparison(other, operator.eq)
def __ne__(self, other):
"""Check whether other does not equal self elementwise.
When either of the elements is masked, the result is masked as well,
but the underlying boolean data are still set, with self and other
considered equal if both are masked, and unequal otherwise.
For structured arrays, all fields are combined, with masked values
ignored. The result is masked if all fields were masked, with self
and other considered equal only if both were fully masked.
"""
return self._comparison(other, operator.ne)
def __add__(self, other):
"""
Add self to other, and return a new masked array.
"""
if self._delegate_binop(other):
return NotImplemented
return add(self, other)
def __radd__(self, other):
"""
Add other to self, and return a new masked array.
"""
# In analogy with __rsub__ and __rdiv__, use original order:
# we get here from `other + self`.
return add(other, self)
def __sub__(self, other):
"""
Subtract other from self, and return a new masked array.
"""
if self._delegate_binop(other):
return NotImplemented
return subtract(self, other)
def __rsub__(self, other):
"""
Subtract self from other, and return a new masked array.
"""
return subtract(other, self)
def __mul__(self, other):
"Multiply self by other, and return a new masked array."
if self._delegate_binop(other):
return NotImplemented
return multiply(self, other)
def __rmul__(self, other):
"""
Multiply other by self, and return a new masked array.
"""
# In analogy with __rsub__ and __rdiv__, use original order:
# we get here from `other * self`.
return multiply(other, self)
def __div__(self, other):
"""
Divide other into self, and return a new masked array.
"""
if self._delegate_binop(other):
return NotImplemented
return divide(self, other)
def __truediv__(self, other):
"""
Divide other into self, and return a new masked array.
"""
if self._delegate_binop(other):
return NotImplemented
return true_divide(self, other)
def __rtruediv__(self, other):
"""
Divide self into other, and return a new masked array.
"""
return true_divide(other, self)
def __floordiv__(self, other):
"""
Divide other into self, and return a new masked array.
"""
if self._delegate_binop(other):
return NotImplemented
return floor_divide(self, other)
def __rfloordiv__(self, other):
"""
Divide self into other, and return a new masked array.
"""
return floor_divide(other, self)
def __pow__(self, other):
"""
Raise self to the power other, masking the potential NaNs/Infs
"""
if self._delegate_binop(other):
return NotImplemented
return power(self, other)
def __rpow__(self, other):
"""
Raise other to the power self, masking the potential NaNs/Infs
"""
return power(other, self)
def __iadd__(self, other):
"""
Add other to self in-place.
"""
m = getmask(other)
if self._mask is nomask:
if m is not nomask and m.any():
self._mask = make_mask_none(self.shape, self.dtype)
self._mask += m
else:
if m is not nomask:
self._mask += m
self._data.__iadd__(np.where(self._mask, self.dtype.type(0),
getdata(other)))
return self
def __isub__(self, other):
"""
Subtract other from self in-place.
"""
m = getmask(other)
if self._mask is nomask:
if m is not nomask and m.any():
self._mask = make_mask_none(self.shape, self.dtype)
self._mask += m
elif m is not nomask:
self._mask += m
self._data.__isub__(np.where(self._mask, self.dtype.type(0),
getdata(other)))
return self
def __imul__(self, other):
"""
Multiply self by other in-place.
"""
m = getmask(other)
if self._mask is nomask:
if m is not nomask and m.any():
self._mask = make_mask_none(self.shape, self.dtype)
self._mask += m
elif m is not nomask:
self._mask += m
self._data.__imul__(np.where(self._mask, self.dtype.type(1),
getdata(other)))
return self
def __idiv__(self, other):
"""
Divide self by other in-place.
"""
other_data = getdata(other)
dom_mask = _DomainSafeDivide().__call__(self._data, other_data)
other_mask = getmask(other)
new_mask = mask_or(other_mask, dom_mask)
# The following 3 lines control the domain filling
if dom_mask.any():
(_, fval) = ufunc_fills[np.divide]
other_data = np.where(dom_mask, fval, other_data)
self._mask |= new_mask
self._data.__idiv__(np.where(self._mask, self.dtype.type(1),
other_data))
return self
def __ifloordiv__(self, other):
"""
Floor divide self by other in-place.
"""
other_data = getdata(other)
dom_mask = _DomainSafeDivide().__call__(self._data, other_data)
other_mask = getmask(other)
new_mask = mask_or(other_mask, dom_mask)
# The following 3 lines control the domain filling
if dom_mask.any():
(_, fval) = ufunc_fills[np.floor_divide]
other_data = np.where(dom_mask, fval, other_data)
self._mask |= new_mask
self._data.__ifloordiv__(np.where(self._mask, self.dtype.type(1),
other_data))
return self
def __itruediv__(self, other):
"""
True divide self by other in-place.
"""
other_data = getdata(other)
dom_mask = _DomainSafeDivide().__call__(self._data, other_data)
other_mask = getmask(other)
new_mask = mask_or(other_mask, dom_mask)
# The following 3 lines control the domain filling
if dom_mask.any():
(_, fval) = ufunc_fills[np.true_divide]
other_data = np.where(dom_mask, fval, other_data)
self._mask |= new_mask
self._data.__itruediv__(np.where(self._mask, self.dtype.type(1),
other_data))
return self
def __ipow__(self, other):
"""
Raise self to the power other, in place.
"""
other_data = getdata(other)
other_mask = getmask(other)
with np.errstate(divide='ignore', invalid='ignore'):
self._data.__ipow__(np.where(self._mask, self.dtype.type(1),
other_data))
invalid = np.logical_not(np.isfinite(self._data))
if invalid.any():
if self._mask is not nomask:
self._mask |= invalid
else:
self._mask = invalid
np.copyto(self._data, self.fill_value, where=invalid)
new_mask = mask_or(other_mask, invalid)
self._mask = mask_or(self._mask, new_mask)
return self
def __float__(self):
"""
Convert to float.
"""
if self.size > 1:
raise TypeError("Only length-1 arrays can be converted "
"to Python scalars")
elif self._mask:
warnings.warn("Warning: converting a masked element to nan.", stacklevel=2)
return np.nan
return float(self.item())
def __int__(self):
"""
Convert to int.
"""
if self.size > 1:
raise TypeError("Only length-1 arrays can be converted "
"to Python scalars")
elif self._mask:
raise MaskError('Cannot convert masked element to a Python int.')
return int(self.item())
def get_imag(self):
"""
Return the imaginary part of the masked array.
The returned array is a view on the imaginary part of the `MaskedArray`
whose `get_imag` method is called.
Parameters
----------
None
Returns
-------
result : MaskedArray
The imaginary part of the masked array.
See Also
--------
get_real, real, imag
Examples
--------
>>> x = np.ma.array([1+1.j, -2j, 3.45+1.6j], mask=[False, True, False])
>>> x.get_imag()
masked_array(data = [1.0 -- 1.6],
mask = [False True False],
fill_value = 1e+20)
"""
result = self._data.imag.view(type(self))
result.__setmask__(self._mask)
return result
imag = property(fget=get_imag, doc="Imaginary part.")
def get_real(self):
"""
Return the real part of the masked array.
The returned array is a view on the real part of the `MaskedArray`
whose `get_real` method is called.
Parameters
----------
None
Returns
-------
result : MaskedArray
The real part of the masked array.
See Also
--------
get_imag, real, imag
Examples
--------
>>> x = np.ma.array([1+1.j, -2j, 3.45+1.6j], mask=[False, True, False])
>>> x.get_real()
masked_array(data = [1.0 -- 3.45],
mask = [False True False],
fill_value = 1e+20)
"""
result = self._data.real.view(type(self))
result.__setmask__(self._mask)
return result
real = property(fget=get_real, doc="Real part")
def count(self, axis=None, keepdims=np._NoValue):
"""
Count the non-masked elements of the array along the given axis.
Parameters
----------
axis : None or int or tuple of ints, optional
Axis or axes along which the count is performed.
The default (`axis` = `None`) performs the count over all
the dimensions of the input array. `axis` may be negative, in
which case it counts from the last to the first axis.
.. versionadded:: 1.10.0
If this is a tuple of ints, the count is performed on multiple
axes, instead of a single axis or all the axes as before.
keepdims : bool, optional
If this is set to True, the axes which are reduced are left
in the result as dimensions with size one. With this option,
the result will broadcast correctly against the array.
Returns
-------
result : ndarray or scalar
An array with the same shape as the input array, with the specified
axis removed. If the array is a 0-d array, or if `axis` is None, a
scalar is returned.
See Also
--------
count_masked : Count masked elements in array or along a given axis.
Examples
--------
>>> import numpy.ma as ma
>>> a = ma.arange(6).reshape((2, 3))
>>> a[1, :] = ma.masked
>>> a
masked_array(data =
[[0 1 2]
[-- -- --]],
mask =
[[False False False]
[ True True True]],
fill_value = 999999)
>>> a.count()
3
When the `axis` keyword is specified an array of appropriate size is
returned.
>>> a.count(axis=0)
array([1, 1, 1])
>>> a.count(axis=1)
array([3, 0])
"""
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
m = self._mask
# special case for matrices (we assume no other subclasses modify
# their dimensions)
if isinstance(self.data, np.matrix):
if m is nomask:
m = np.zeros(self.shape, dtype=np.bool_)
m = m.view(type(self.data))
if m is nomask:
# compare to _count_reduce_items in _methods.py
if self.shape is ():
if axis not in (None, 0):
raise np.AxisError(axis=axis, ndim=self.ndim)
return 1
elif axis is None:
if kwargs.get('keepdims', False):
return np.array(self.size, dtype=np.intp, ndmin=self.ndim)
return self.size
axes = normalize_axis_tuple(axis, self.ndim)
items = 1
for ax in axes:
items *= self.shape[ax]
if kwargs.get('keepdims', False):
out_dims = list(self.shape)
for a in axes:
out_dims[a] = 1
else:
out_dims = [d for n, d in enumerate(self.shape)
if n not in axes]
# make sure to return a 0-d array if axis is supplied
return np.full(out_dims, items, dtype=np.intp)
# take care of the masked singleton
if self is masked:
return 0
return (~m).sum(axis=axis, dtype=np.intp, **kwargs)
flatten = _arraymethod('flatten')
def ravel(self, order='C'):
"""
Returns a 1D version of self, as a view.
Parameters
----------
order : {'C', 'F', 'A', 'K'}, optional
The elements of `a` are read using this index order. 'C' means to
index the elements in C-like order, with the last axis index
changing fastest, back to the first axis index changing slowest.
'F' means to index the elements in Fortran-like index order, with
the first index changing fastest, and the last index changing
slowest. Note that the 'C' and 'F' options take no account of the
memory layout of the underlying array, and only refer to the order
of axis indexing. 'A' means to read the elements in Fortran-like
index order if `m` is Fortran *contiguous* in memory, C-like order
otherwise. 'K' means to read the elements in the order they occur
in memory, except for reversing the data when strides are negative.
By default, 'C' index order is used.
Returns
-------
MaskedArray
Output view is of shape ``(self.size,)`` (or
``(np.ma.product(self.shape),)``).
Examples
--------
>>> x = np.ma.array([[1,2,3],[4,5,6],[7,8,9]], mask=[0] + [1,0]*4)
>>> print(x)
[[1 -- 3]
[-- 5 --]
[7 -- 9]]
>>> print(x.ravel())
[1 -- 3 -- 5 -- 7 -- 9]
"""
r = ndarray.ravel(self._data, order=order).view(type(self))
r._update_from(self)
if self._mask is not nomask:
r._mask = ndarray.ravel(self._mask, order=order).reshape(r.shape)
else:
r._mask = nomask
return r
repeat = _arraymethod('repeat')
def reshape(self, *s, **kwargs):
"""
Give a new shape to the array without changing its data.
Returns a masked array containing the same data, but with a new shape.
The result is a view on the original array; if this is not possible, a
ValueError is raised.
Parameters
----------
shape : int or tuple of ints
The new shape should be compatible with the original shape. If an
integer is supplied, then the result will be a 1-D array of that
length.
order : {'C', 'F'}, optional
Determines whether the array data should be viewed as in C
(row-major) or FORTRAN (column-major) order.
Returns
-------
reshaped_array : array
A new view on the array.
See Also
--------
reshape : Equivalent function in the masked array module.
numpy.ndarray.reshape : Equivalent method on ndarray object.
numpy.reshape : Equivalent function in the NumPy module.
Notes
-----
The reshaping operation cannot guarantee that a copy will not be made,
to modify the shape in place, use ``a.shape = s``
Examples
--------
>>> x = np.ma.array([[1,2],[3,4]], mask=[1,0,0,1])
>>> print(x)
[[-- 2]
[3 --]]
>>> x = x.reshape((4,1))
>>> print(x)
[[--]
[2]
[3]
[--]]
"""
kwargs.update(order=kwargs.get('order', 'C'))
result = self._data.reshape(*s, **kwargs).view(type(self))
result._update_from(self)
mask = self._mask
if mask is not nomask:
result._mask = mask.reshape(*s, **kwargs)
return result
def resize(self, newshape, refcheck=True, order=False):
"""
.. warning::
This method does nothing, except raise a ValueError exception. A
masked array does not own its data and therefore cannot safely be
resized in place. Use the `numpy.ma.resize` function instead.
This method is difficult to implement safely and may be deprecated in
future releases of NumPy.
"""
# Note : the 'order' keyword looks broken, let's just drop it
errmsg = "A masked array does not own its data "\
"and therefore cannot be resized.\n" \
"Use the numpy.ma.resize function instead."
raise ValueError(errmsg)
def put(self, indices, values, mode='raise'):
"""
Set storage-indexed locations to corresponding values.
Sets self._data.flat[n] = values[n] for each n in indices.
If `values` is shorter than `indices` then it will repeat.
If `values` has some masked values, the initial mask is updated
in consequence, else the corresponding values are unmasked.
Parameters
----------
indices : 1-D array_like
Target indices, interpreted as integers.
values : array_like
Values to place in self._data copy at target indices.
mode : {'raise', 'wrap', 'clip'}, optional
Specifies how out-of-bounds indices will behave.
'raise' : raise an error.
'wrap' : wrap around.
'clip' : clip to the range.
Notes
-----
`values` can be a scalar or length 1 array.
Examples
--------
>>> x = np.ma.array([[1,2,3],[4,5,6],[7,8,9]], mask=[0] + [1,0]*4)
>>> print(x)
[[1 -- 3]
[-- 5 --]
[7 -- 9]]
>>> x.put([0,4,8],[10,20,30])
>>> print(x)
[[10 -- 3]
[-- 20 --]
[7 -- 30]]
>>> x.put(4,999)
>>> print(x)
[[10 -- 3]
[-- 999 --]
[7 -- 30]]
"""
# Hard mask: Get rid of the values/indices that fall on masked data
if self._hardmask and self._mask is not nomask:
mask = self._mask[indices]
indices = narray(indices, copy=False)
values = narray(values, copy=False, subok=True)
values.resize(indices.shape)
indices = indices[~mask]
values = values[~mask]
self._data.put(indices, values, mode=mode)
# short circuit if neither self nor values are masked
if self._mask is nomask and getmask(values) is nomask:
return
m = getmaskarray(self).copy()
if getmask(values) is nomask:
m.put(indices, False, mode=mode)
else:
m.put(indices, values._mask, mode=mode)
m = make_mask(m, copy=False, shrink=True)
self._mask = m
return
def ids(self):
"""
Return the addresses of the data and mask areas.
Parameters
----------
None
Examples
--------
>>> x = np.ma.array([1, 2, 3], mask=[0, 1, 1])
>>> x.ids()
(166670640, 166659832)
If the array has no mask, the address of `nomask` is returned. This address
is typically not close to the data in memory:
>>> x = np.ma.array([1, 2, 3])
>>> x.ids()
(166691080, 3083169284L)
"""
if self._mask is nomask:
return (self.ctypes.data, id(nomask))
return (self.ctypes.data, self._mask.ctypes.data)
def iscontiguous(self):
"""
Return a boolean indicating whether the data is contiguous.
Parameters
----------
None
Examples
--------
>>> x = np.ma.array([1, 2, 3])
>>> x.iscontiguous()
True
`iscontiguous` returns one of the flags of the masked array:
>>> x.flags
C_CONTIGUOUS : True
F_CONTIGUOUS : True
OWNDATA : False
WRITEABLE : True
ALIGNED : True
UPDATEIFCOPY : False
"""
return self.flags['CONTIGUOUS']
def all(self, axis=None, out=None, keepdims=np._NoValue):
"""
Returns True if all elements evaluate to True.
The output array is masked where all the values along the given axis
are masked: if the output would have been a scalar and that all the
values are masked, then the output is `masked`.
Refer to `numpy.all` for full documentation.
See Also
--------
ndarray.all : corresponding function for ndarrays
numpy.all : equivalent function
Examples
--------
>>> np.ma.array([1,2,3]).all()
True
>>> a = np.ma.array([1,2,3], mask=True)
>>> (a.all() is np.ma.masked)
True
"""
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
mask = _check_mask_axis(self._mask, axis, **kwargs)
if out is None:
d = self.filled(True).all(axis=axis, **kwargs).view(type(self))
if d.ndim:
d.__setmask__(mask)
elif mask:
return masked
return d
self.filled(True).all(axis=axis, out=out, **kwargs)
if isinstance(out, MaskedArray):
if out.ndim or mask:
out.__setmask__(mask)
return out
def any(self, axis=None, out=None, keepdims=np._NoValue):
"""
Returns True if any of the elements of `a` evaluate to True.
Masked values are considered as False during computation.
Refer to `numpy.any` for full documentation.
See Also
--------
ndarray.any : corresponding function for ndarrays
numpy.any : equivalent function
"""
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
mask = _check_mask_axis(self._mask, axis, **kwargs)
if out is None:
d = self.filled(False).any(axis=axis, **kwargs).view(type(self))
if d.ndim:
d.__setmask__(mask)
elif mask:
d = masked
return d
self.filled(False).any(axis=axis, out=out, **kwargs)
if isinstance(out, MaskedArray):
if out.ndim or mask:
out.__setmask__(mask)
return out
def nonzero(self):
"""
Return the indices of unmasked elements that are not zero.
Returns a tuple of arrays, one for each dimension, containing the
indices of the non-zero elements in that dimension. The corresponding
non-zero values can be obtained with::
a[a.nonzero()]
To group the indices by element, rather than dimension, use
instead::
np.transpose(a.nonzero())
The result of this is always a 2d array, with a row for each non-zero
element.
Parameters
----------
None
Returns
-------
tuple_of_arrays : tuple
Indices of elements that are non-zero.
See Also
--------
numpy.nonzero :
Function operating on ndarrays.
flatnonzero :
Return indices that are non-zero in the flattened version of the input
array.
ndarray.nonzero :
Equivalent ndarray method.
count_nonzero :
Counts the number of non-zero elements in the input array.
Examples
--------
>>> import numpy.ma as ma
>>> x = ma.array(np.eye(3))
>>> x
masked_array(data =
[[ 1. 0. 0.]
[ 0. 1. 0.]
[ 0. 0. 1.]],
mask =
False,
fill_value=1e+20)
>>> x.nonzero()
(array([0, 1, 2]), array([0, 1, 2]))
Masked elements are ignored.
>>> x[1, 1] = ma.masked
>>> x
masked_array(data =
[[1.0 0.0 0.0]
[0.0 -- 0.0]
[0.0 0.0 1.0]],
mask =
[[False False False]
[False True False]
[False False False]],
fill_value=1e+20)
>>> x.nonzero()
(array([0, 2]), array([0, 2]))
Indices can also be grouped by element.
>>> np.transpose(x.nonzero())
array([[0, 0],
[2, 2]])
A common use for ``nonzero`` is to find the indices of an array, where
a condition is True. Given an array `a`, the condition `a` > 3 is a
boolean array and since False is interpreted as 0, ma.nonzero(a > 3)
yields the indices of the `a` where the condition is true.
>>> a = ma.array([[1,2,3],[4,5,6],[7,8,9]])
>>> a > 3
masked_array(data =
[[False False False]
[ True True True]
[ True True True]],
mask =
False,
fill_value=999999)
>>> ma.nonzero(a > 3)
(array([1, 1, 1, 2, 2, 2]), array([0, 1, 2, 0, 1, 2]))
The ``nonzero`` method of the condition array can also be called.
>>> (a > 3).nonzero()
(array([1, 1, 1, 2, 2, 2]), array([0, 1, 2, 0, 1, 2]))
"""
return narray(self.filled(0), copy=False).nonzero()
def trace(self, offset=0, axis1=0, axis2=1, dtype=None, out=None):
"""
(this docstring should be overwritten)
"""
#!!!: implement out + test!
m = self._mask
if m is nomask:
result = super(MaskedArray, self).trace(offset=offset, axis1=axis1,
axis2=axis2, out=out)
return result.astype(dtype)
else:
D = self.diagonal(offset=offset, axis1=axis1, axis2=axis2)
return D.astype(dtype).filled(0).sum(axis=None, out=out)
trace.__doc__ = ndarray.trace.__doc__
def dot(self, b, out=None, strict=False):
"""
a.dot(b, out=None)
Masked dot product of two arrays. Note that `out` and `strict` are
located in different positions than in `ma.dot`. In order to
maintain compatibility with the functional version, it is
recommended that the optional arguments be treated as keyword only.
At some point that may be mandatory.
.. versionadded:: 1.10.0
Parameters
----------
b : masked_array_like
Inputs array.
out : masked_array, optional
Output argument. This must have the exact kind that would be
returned if it was not used. In particular, it must have the
right type, must be C-contiguous, and its dtype must be the
dtype that would be returned for `ma.dot(a,b)`. This is a
performance feature. Therefore, if these conditions are not
met, an exception is raised, instead of attempting to be
flexible.
strict : bool, optional
Whether masked data are propagated (True) or set to 0 (False)
for the computation. Default is False. Propagating the mask
means that if a masked value appears in a row or column, the
whole row or column is considered masked.
.. versionadded:: 1.10.2
See Also
--------
numpy.ma.dot : equivalent function
"""
return dot(self, b, out=out, strict=strict)
def sum(self, axis=None, dtype=None, out=None, keepdims=np._NoValue):
"""
Return the sum of the array elements over the given axis.
Masked elements are set to 0 internally.
Refer to `numpy.sum` for full documentation.
See Also
--------
ndarray.sum : corresponding function for ndarrays
numpy.sum : equivalent function
Examples
--------
>>> x = np.ma.array([[1,2,3],[4,5,6],[7,8,9]], mask=[0] + [1,0]*4)
>>> print(x)
[[1 -- 3]
[-- 5 --]
[7 -- 9]]
>>> print(x.sum())
25
>>> print(x.sum(axis=1))
[4 5 16]
>>> print(x.sum(axis=0))
[8 5 12]
>>> print(type(x.sum(axis=0, dtype=np.int64)[0]))
<type 'numpy.int64'>
"""
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
_mask = self._mask
newmask = _check_mask_axis(_mask, axis, **kwargs)
# No explicit output
if out is None:
result = self.filled(0).sum(axis, dtype=dtype, **kwargs)
rndim = getattr(result, 'ndim', 0)
if rndim:
result = result.view(type(self))
result.__setmask__(newmask)
elif newmask:
result = masked
return result
# Explicit output
result = self.filled(0).sum(axis, dtype=dtype, out=out, **kwargs)
if isinstance(out, MaskedArray):
outmask = getmask(out)
if (outmask is nomask):
outmask = out._mask = make_mask_none(out.shape)
outmask.flat = newmask
return out
def cumsum(self, axis=None, dtype=None, out=None):
"""
Return the cumulative sum of the array elements over the given axis.
Masked values are set to 0 internally during the computation.
However, their position is saved, and the result will be masked at
the same locations.
Refer to `numpy.cumsum` for full documentation.
Notes
-----
The mask is lost if `out` is not a valid :class:`MaskedArray` !
Arithmetic is modular when using integer types, and no error is
raised on overflow.
See Also
--------
ndarray.cumsum : corresponding function for ndarrays
numpy.cumsum : equivalent function
Examples
--------
>>> marr = np.ma.array(np.arange(10), mask=[0,0,0,1,1,1,0,0,0,0])
>>> print(marr.cumsum())
[0 1 3 -- -- -- 9 16 24 33]
"""
result = self.filled(0).cumsum(axis=axis, dtype=dtype, out=out)
if out is not None:
if isinstance(out, MaskedArray):
out.__setmask__(self.mask)
return out
result = result.view(type(self))
result.__setmask__(self._mask)
return result
def prod(self, axis=None, dtype=None, out=None, keepdims=np._NoValue):
"""
Return the product of the array elements over the given axis.
Masked elements are set to 1 internally for computation.
Refer to `numpy.prod` for full documentation.
Notes
-----
Arithmetic is modular when using integer types, and no error is raised
on overflow.
See Also
--------
ndarray.prod : corresponding function for ndarrays
numpy.prod : equivalent function
"""
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
_mask = self._mask
newmask = _check_mask_axis(_mask, axis, **kwargs)
# No explicit output
if out is None:
result = self.filled(1).prod(axis, dtype=dtype, **kwargs)
rndim = getattr(result, 'ndim', 0)
if rndim:
result = result.view(type(self))
result.__setmask__(newmask)
elif newmask:
result = masked
return result
# Explicit output
result = self.filled(1).prod(axis, dtype=dtype, out=out, **kwargs)
if isinstance(out, MaskedArray):
outmask = getmask(out)
if (outmask is nomask):
outmask = out._mask = make_mask_none(out.shape)
outmask.flat = newmask
return out
product = prod
def cumprod(self, axis=None, dtype=None, out=None):
"""
Return the cumulative product of the array elements over the given axis.
Masked values are set to 1 internally during the computation.
However, their position is saved, and the result will be masked at
the same locations.
Refer to `numpy.cumprod` for full documentation.
Notes
-----
The mask is lost if `out` is not a valid MaskedArray !
Arithmetic is modular when using integer types, and no error is
raised on overflow.
See Also
--------
ndarray.cumprod : corresponding function for ndarrays
numpy.cumprod : equivalent function
"""
result = self.filled(1).cumprod(axis=axis, dtype=dtype, out=out)
if out is not None:
if isinstance(out, MaskedArray):
out.__setmask__(self._mask)
return out
result = result.view(type(self))
result.__setmask__(self._mask)
return result
def mean(self, axis=None, dtype=None, out=None, keepdims=np._NoValue):
"""
Returns the average of the array elements along given axis.
Masked entries are ignored, and result elements which are not
finite will be masked.
Refer to `numpy.mean` for full documentation.
See Also
--------
ndarray.mean : corresponding function for ndarrays
numpy.mean : Equivalent function
numpy.ma.average: Weighted average.
Examples
--------
>>> a = np.ma.array([1,2,3], mask=[False, False, True])
>>> a
masked_array(data = [1 2 --],
mask = [False False True],
fill_value = 999999)
>>> a.mean()
1.5
"""
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
if self._mask is nomask:
result = super(MaskedArray, self).mean(axis=axis,
dtype=dtype, **kwargs)[()]
else:
dsum = self.sum(axis=axis, dtype=dtype, **kwargs)
cnt = self.count(axis=axis, **kwargs)
if cnt.shape == () and (cnt == 0):
result = masked
else:
result = dsum * 1. / cnt
if out is not None:
out.flat = result
if isinstance(out, MaskedArray):
outmask = getmask(out)
if (outmask is nomask):
outmask = out._mask = make_mask_none(out.shape)
outmask.flat = getmask(result)
return out
return result
def anom(self, axis=None, dtype=None):
"""
Compute the anomalies (deviations from the arithmetic mean)
along the given axis.
Returns an array of anomalies, with the same shape as the input and
where the arithmetic mean is computed along the given axis.
Parameters
----------
axis : int, optional
Axis over which the anomalies are taken.
The default is to use the mean of the flattened array as reference.
dtype : dtype, optional
Type to use in computing the variance. For arrays of integer type
the default is float32; for arrays of float types it is the same as
the array type.
See Also
--------
mean : Compute the mean of the array.
Examples
--------
>>> a = np.ma.array([1,2,3])
>>> a.anom()
masked_array(data = [-1. 0. 1.],
mask = False,
fill_value = 1e+20)
"""
m = self.mean(axis, dtype)
if m is masked:
return m
if not axis:
return (self - m)
else:
return (self - expand_dims(m, axis))
def var(self, axis=None, dtype=None, out=None, ddof=0,
keepdims=np._NoValue):
"""
Returns the variance of the array elements along given axis.
Masked entries are ignored, and result elements which are not
finite will be masked.
Refer to `numpy.var` for full documentation.
See Also
--------
ndarray.var : corresponding function for ndarrays
numpy.var : Equivalent function
"""
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
# Easy case: nomask, business as usual
if self._mask is nomask:
ret = super(MaskedArray, self).var(axis=axis, dtype=dtype, out=out,
ddof=ddof, **kwargs)[()]
if out is not None:
if isinstance(out, MaskedArray):
out.__setmask__(nomask)
return out
return ret
# Some data are masked, yay!
cnt = self.count(axis=axis, **kwargs) - ddof
danom = self - self.mean(axis, dtype, keepdims=True)
if iscomplexobj(self):
danom = umath.absolute(danom) ** 2
else:
danom *= danom
dvar = divide(danom.sum(axis, **kwargs), cnt).view(type(self))
# Apply the mask if it's not a scalar
if dvar.ndim:
dvar._mask = mask_or(self._mask.all(axis, **kwargs), (cnt <= 0))
dvar._update_from(self)
elif getmask(dvar):
# Make sure that masked is returned when the scalar is masked.
dvar = masked
if out is not None:
if isinstance(out, MaskedArray):
out.flat = 0
out.__setmask__(True)
elif out.dtype.kind in 'biu':
errmsg = "Masked data information would be lost in one or "\
"more location."
raise MaskError(errmsg)
else:
out.flat = np.nan
return out
# In case with have an explicit output
if out is not None:
# Set the data
out.flat = dvar
# Set the mask if needed
if isinstance(out, MaskedArray):
out.__setmask__(dvar.mask)
return out
return dvar
var.__doc__ = np.var.__doc__
def std(self, axis=None, dtype=None, out=None, ddof=0,
keepdims=np._NoValue):
"""
Returns the standard deviation of the array elements along given axis.
Masked entries are ignored.
Refer to `numpy.std` for full documentation.
See Also
--------
ndarray.std : corresponding function for ndarrays
numpy.std : Equivalent function
"""
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
dvar = self.var(axis, dtype, out, ddof, **kwargs)
if dvar is not masked:
if out is not None:
np.power(out, 0.5, out=out, casting='unsafe')
return out
dvar = sqrt(dvar)
return dvar
def round(self, decimals=0, out=None):
"""
Return each element rounded to the given number of decimals.
Refer to `numpy.around` for full documentation.
See Also
--------
ndarray.around : corresponding function for ndarrays
numpy.around : equivalent function
"""
result = self._data.round(decimals=decimals, out=out).view(type(self))
if result.ndim > 0:
result._mask = self._mask
result._update_from(self)
elif self._mask:
# Return masked when the scalar is masked
result = masked
# No explicit output: we're done
if out is None:
return result
if isinstance(out, MaskedArray):
out.__setmask__(self._mask)
return out
def argsort(self, axis=np._NoValue, kind='quicksort', order=None,
endwith=True, fill_value=None):
"""
Return an ndarray of indices that sort the array along the
specified axis. Masked values are filled beforehand to
`fill_value`.
Parameters
----------
axis : int, optional
Axis along which to sort. If None, the default, the flattened array
is used.
.. versionchanged:: 1.13.0
Previously, the default was documented to be -1, but that was
in error. At some future date, the default will change to -1, as
originally intended.
Until then, the axis should be given explicitly when
``arr.ndim > 1``, to avoid a FutureWarning.
kind : {'quicksort', 'mergesort', 'heapsort'}, optional
Sorting algorithm.
order : list, optional
When `a` is an array with fields defined, this argument specifies
which fields to compare first, second, etc. Not all fields need be
specified.
endwith : {True, False}, optional
Whether missing values (if any) should be treated as the largest values
(True) or the smallest values (False)
When the array contains unmasked values at the same extremes of the
datatype, the ordering of these values and the masked values is
undefined.
fill_value : {var}, optional
Value used internally for the masked values.
If ``fill_value`` is not None, it supersedes ``endwith``.
Returns
-------
index_array : ndarray, int
Array of indices that sort `a` along the specified axis.
In other words, ``a[index_array]`` yields a sorted `a`.
See Also
--------
MaskedArray.sort : Describes sorting algorithms used.
lexsort : Indirect stable sort with multiple keys.
ndarray.sort : Inplace sort.
Notes
-----
See `sort` for notes on the different sorting algorithms.
Examples
--------
>>> a = np.ma.array([3,2,1], mask=[False, False, True])
>>> a
masked_array(data = [3 2 --],
mask = [False False True],
fill_value = 999999)
>>> a.argsort()
array([1, 0, 2])
"""
# 2017-04-11, Numpy 1.13.0, gh-8701: warn on axis default
if axis is np._NoValue:
axis = _deprecate_argsort_axis(self)
if fill_value is None:
if endwith:
# nan > inf
if np.issubdtype(self.dtype, np.floating):
fill_value = np.nan
else:
fill_value = minimum_fill_value(self)
else:
fill_value = maximum_fill_value(self)
filled = self.filled(fill_value)
return filled.argsort(axis=axis, kind=kind, order=order)
def argmin(self, axis=None, fill_value=None, out=None):
"""
Return array of indices to the minimum values along the given axis.
Parameters
----------
axis : {None, integer}
If None, the index is into the flattened array, otherwise along
the specified axis
fill_value : {var}, optional
Value used to fill in the masked values. If None, the output of
minimum_fill_value(self._data) is used instead.
out : {None, array}, optional
Array into which the result can be placed. Its type is preserved
and it must be of the right shape to hold the output.
Returns
-------
ndarray or scalar
If multi-dimension input, returns a new ndarray of indices to the
minimum values along the given axis. Otherwise, returns a scalar
of index to the minimum values along the given axis.
Examples
--------
>>> x = np.ma.array(arange(4), mask=[1,1,0,0])
>>> x.shape = (2,2)
>>> print(x)
[[-- --]
[2 3]]
>>> print(x.argmin(axis=0, fill_value=-1))
[0 0]
>>> print(x.argmin(axis=0, fill_value=9))
[1 1]
"""
if fill_value is None:
fill_value = minimum_fill_value(self)
d = self.filled(fill_value).view(ndarray)
return d.argmin(axis, out=out)
def argmax(self, axis=None, fill_value=None, out=None):
"""
Returns array of indices of the maximum values along the given axis.
Masked values are treated as if they had the value fill_value.
Parameters
----------
axis : {None, integer}
If None, the index is into the flattened array, otherwise along
the specified axis
fill_value : {var}, optional
Value used to fill in the masked values. If None, the output of
maximum_fill_value(self._data) is used instead.
out : {None, array}, optional
Array into which the result can be placed. Its type is preserved
and it must be of the right shape to hold the output.
Returns
-------
index_array : {integer_array}
Examples
--------
>>> a = np.arange(6).reshape(2,3)
>>> a.argmax()
5
>>> a.argmax(0)
array([1, 1, 1])
>>> a.argmax(1)
array([2, 2])
"""
if fill_value is None:
fill_value = maximum_fill_value(self._data)
d = self.filled(fill_value).view(ndarray)
return d.argmax(axis, out=out)
def sort(self, axis=-1, kind='quicksort', order=None,
endwith=True, fill_value=None):
"""
Sort the array, in-place
Parameters
----------
a : array_like
Array to be sorted.
axis : int, optional
Axis along which to sort. If None, the array is flattened before
sorting. The default is -1, which sorts along the last axis.
kind : {'quicksort', 'mergesort', 'heapsort'}, optional
Sorting algorithm. Default is 'quicksort'.
order : list, optional
When `a` is a structured array, this argument specifies which fields
to compare first, second, and so on. This list does not need to
include all of the fields.
endwith : {True, False}, optional
Whether missing values (if any) should be treated as the largest values
(True) or the smallest values (False)
When the array contains unmasked values at the same extremes of the
datatype, the ordering of these values and the masked values is
undefined.
fill_value : {var}, optional
Value used internally for the masked values.
If ``fill_value`` is not None, it supersedes ``endwith``.
Returns
-------
sorted_array : ndarray
Array of the same type and shape as `a`.
See Also
--------
ndarray.sort : Method to sort an array in-place.
argsort : Indirect sort.
lexsort : Indirect stable sort on multiple keys.
searchsorted : Find elements in a sorted array.
Notes
-----
See ``sort`` for notes on the different sorting algorithms.
Examples
--------
>>> a = ma.array([1, 2, 5, 4, 3],mask=[0, 1, 0, 1, 0])
>>> # Default
>>> a.sort()
>>> print(a)
[1 3 5 -- --]
>>> a = ma.array([1, 2, 5, 4, 3],mask=[0, 1, 0, 1, 0])
>>> # Put missing values in the front
>>> a.sort(endwith=False)
>>> print(a)
[-- -- 1 3 5]
>>> a = ma.array([1, 2, 5, 4, 3],mask=[0, 1, 0, 1, 0])
>>> # fill_value takes over endwith
>>> a.sort(endwith=False, fill_value=3)
>>> print(a)
[1 -- -- 3 5]
"""
if self._mask is nomask:
ndarray.sort(self, axis=axis, kind=kind, order=order)
return
if self is masked:
return
sidx = self.argsort(axis=axis, kind=kind, order=order,
fill_value=fill_value, endwith=endwith)
# save memory for 1d arrays
if self.ndim == 1:
idx = sidx
else:
idx = list(np.ix_(*[np.arange(x) for x in self.shape]))
idx[axis] = sidx
self[...] = self[idx]
def min(self, axis=None, out=None, fill_value=None, keepdims=np._NoValue):
"""
Return the minimum along a given axis.
Parameters
----------
axis : {None, int}, optional
Axis along which to operate. By default, ``axis`` is None and the
flattened input is used.
out : array_like, optional
Alternative output array in which to place the result. Must be of
the same shape and buffer length as the expected output.
fill_value : {var}, optional
Value used to fill in the masked values.
If None, use the output of `minimum_fill_value`.
Returns
-------
amin : array_like
New array holding the result.
If ``out`` was specified, ``out`` is returned.
See Also
--------
minimum_fill_value
Returns the minimum filling value for a given datatype.
"""
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
_mask = self._mask
newmask = _check_mask_axis(_mask, axis, **kwargs)
if fill_value is None:
fill_value = minimum_fill_value(self)
# No explicit output
if out is None:
result = self.filled(fill_value).min(
axis=axis, out=out, **kwargs).view(type(self))
if result.ndim:
# Set the mask
result.__setmask__(newmask)
# Get rid of Infs
if newmask.ndim:
np.copyto(result, result.fill_value, where=newmask)
elif newmask:
result = masked
return result
# Explicit output
result = self.filled(fill_value).min(axis=axis, out=out, **kwargs)
if isinstance(out, MaskedArray):
outmask = getmask(out)
if (outmask is nomask):
outmask = out._mask = make_mask_none(out.shape)
outmask.flat = newmask
else:
if out.dtype.kind in 'biu':
errmsg = "Masked data information would be lost in one or more"\
" location."
raise MaskError(errmsg)
np.copyto(out, np.nan, where=newmask)
return out
# unique to masked arrays
def mini(self, axis=None):
"""
Return the array minimum along the specified axis.
.. deprecated:: 1.13.0
This function is identical to both:
* ``self.min(keepdims=True, axis=axis).squeeze(axis=axis)``
* ``np.ma.minimum.reduce(self, axis=axis)``
Typically though, ``self.min(axis=axis)`` is sufficient.
Parameters
----------
axis : int, optional
The axis along which to find the minima. Default is None, in which case
the minimum value in the whole array is returned.
Returns
-------
min : scalar or MaskedArray
If `axis` is None, the result is a scalar. Otherwise, if `axis` is
given and the array is at least 2-D, the result is a masked array with
dimension one smaller than the array on which `mini` is called.
Examples
--------
>>> x = np.ma.array(np.arange(6), mask=[0 ,1, 0, 0, 0 ,1]).reshape(3, 2)
>>> print(x)
[[0 --]
[2 3]
[4 --]]
>>> x.mini()
0
>>> x.mini(axis=0)
masked_array(data = [0 3],
mask = [False False],
fill_value = 999999)
>>> print(x.mini(axis=1))
[0 2 4]
There is a small difference between `mini` and `min`:
>>> x[:,1].mini(axis=0)
masked_array(data = --,
mask = True,
fill_value = 999999)
>>> x[:,1].min(axis=0)
masked
"""
# 2016-04-13, 1.13.0, gh-8764
warnings.warn(
"`mini` is deprecated; use the `min` method or "
"`np.ma.minimum.reduce instead.",
DeprecationWarning, stacklevel=2)
return minimum.reduce(self, axis)
def max(self, axis=None, out=None, fill_value=None, keepdims=np._NoValue):
"""
Return the maximum along a given axis.
Parameters
----------
axis : {None, int}, optional
Axis along which to operate. By default, ``axis`` is None and the
flattened input is used.
out : array_like, optional
Alternative output array in which to place the result. Must
be of the same shape and buffer length as the expected output.
fill_value : {var}, optional
Value used to fill in the masked values.
If None, use the output of maximum_fill_value().
Returns
-------
amax : array_like
New array holding the result.
If ``out`` was specified, ``out`` is returned.
See Also
--------
maximum_fill_value
Returns the maximum filling value for a given datatype.
"""
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
_mask = self._mask
newmask = _check_mask_axis(_mask, axis, **kwargs)
if fill_value is None:
fill_value = maximum_fill_value(self)
# No explicit output
if out is None:
result = self.filled(fill_value).max(
axis=axis, out=out, **kwargs).view(type(self))
if result.ndim:
# Set the mask
result.__setmask__(newmask)
# Get rid of Infs
if newmask.ndim:
np.copyto(result, result.fill_value, where=newmask)
elif newmask:
result = masked
return result
# Explicit output
result = self.filled(fill_value).max(axis=axis, out=out, **kwargs)
if isinstance(out, MaskedArray):
outmask = getmask(out)
if (outmask is nomask):
outmask = out._mask = make_mask_none(out.shape)
outmask.flat = newmask
else:
if out.dtype.kind in 'biu':
errmsg = "Masked data information would be lost in one or more"\
" location."
raise MaskError(errmsg)
np.copyto(out, np.nan, where=newmask)
return out
def ptp(self, axis=None, out=None, fill_value=None):
"""
Return (maximum - minimum) along the given dimension
(i.e. peak-to-peak value).
Parameters
----------
axis : {None, int}, optional
Axis along which to find the peaks. If None (default) the
flattened array is used.
out : {None, array_like}, optional
Alternative output array in which to place the result. It must
have the same shape and buffer length as the expected output
but the type will be cast if necessary.
fill_value : {var}, optional
Value used to fill in the masked values.
Returns
-------
ptp : ndarray.
A new array holding the result, unless ``out`` was
specified, in which case a reference to ``out`` is returned.
"""
if out is None:
result = self.max(axis=axis, fill_value=fill_value)
result -= self.min(axis=axis, fill_value=fill_value)
return result
out.flat = self.max(axis=axis, out=out, fill_value=fill_value)
min_value = self.min(axis=axis, fill_value=fill_value)
np.subtract(out, min_value, out=out, casting='unsafe')
return out
def partition(self, *args, **kwargs):
warnings.warn("Warning: 'partition' will ignore the 'mask' "
"of the {}.".format(self.__class__.__name__),
stacklevel=2)
return super(MaskedArray, self).partition(*args, **kwargs)
def argpartition(self, *args, **kwargs):
warnings.warn("Warning: 'argpartition' will ignore the 'mask' "
"of the {}.".format(self.__class__.__name__),
stacklevel=2)
return super(MaskedArray, self).argpartition(*args, **kwargs)
def take(self, indices, axis=None, out=None, mode='raise'):
"""
"""
(_data, _mask) = (self._data, self._mask)
cls = type(self)
# Make sure the indices are not masked
maskindices = getmask(indices)
if maskindices is not nomask:
indices = indices.filled(0)
# Get the data, promoting scalars to 0d arrays with [...] so that
# .view works correctly
if out is None:
out = _data.take(indices, axis=axis, mode=mode)[...].view(cls)
else:
np.take(_data, indices, axis=axis, mode=mode, out=out)
# Get the mask
if isinstance(out, MaskedArray):
if _mask is nomask:
outmask = maskindices
else:
outmask = _mask.take(indices, axis=axis, mode=mode)
outmask |= maskindices
out.__setmask__(outmask)
# demote 0d arrays back to scalars, for consistency with ndarray.take
return out[()]
# Array methods
copy = _arraymethod('copy')
diagonal = _arraymethod('diagonal')
transpose = _arraymethod('transpose')
T = property(fget=lambda self: self.transpose())
swapaxes = _arraymethod('swapaxes')
clip = _arraymethod('clip', onmask=False)
copy = _arraymethod('copy')
squeeze = _arraymethod('squeeze')
def tolist(self, fill_value=None):
"""
Return the data portion of the masked array as a hierarchical Python list.
Data items are converted to the nearest compatible Python type.
Masked values are converted to `fill_value`. If `fill_value` is None,
the corresponding entries in the output list will be ``None``.
Parameters
----------
fill_value : scalar, optional
The value to use for invalid entries. Default is None.
Returns
-------
result : list
The Python list representation of the masked array.
Examples
--------
>>> x = np.ma.array([[1,2,3], [4,5,6], [7,8,9]], mask=[0] + [1,0]*4)
>>> x.tolist()
[[1, None, 3], [None, 5, None], [7, None, 9]]
>>> x.tolist(-999)
[[1, -999, 3], [-999, 5, -999], [7, -999, 9]]
"""
_mask = self._mask
# No mask ? Just return .data.tolist ?
if _mask is nomask:
return self._data.tolist()
# Explicit fill_value: fill the array and get the list
if fill_value is not None:
return self.filled(fill_value).tolist()
# Structured array.
names = self.dtype.names
if names:
result = self._data.astype([(_, object) for _ in names])
for n in names:
result[n][_mask[n]] = None
return result.tolist()
# Standard arrays.
if _mask is nomask:
return [None]
# Set temps to save time when dealing w/ marrays.
inishape = self.shape
result = np.array(self._data.ravel(), dtype=object)
result[_mask.ravel()] = None
result.shape = inishape
return result.tolist()
def tostring(self, fill_value=None, order='C'):
"""
This function is a compatibility alias for tobytes. Despite its name it
returns bytes not strings.
"""
return self.tobytes(fill_value, order='C')
def tobytes(self, fill_value=None, order='C'):
"""
Return the array data as a string containing the raw bytes in the array.
The array is filled with a fill value before the string conversion.
.. versionadded:: 1.9.0
Parameters
----------
fill_value : scalar, optional
Value used to fill in the masked values. Default is None, in which
case `MaskedArray.fill_value` is used.
order : {'C','F','A'}, optional
Order of the data item in the copy. Default is 'C'.
- 'C' -- C order (row major).
- 'F' -- Fortran order (column major).
- 'A' -- Any, current order of array.
- None -- Same as 'A'.
See Also
--------
ndarray.tobytes
tolist, tofile
Notes
-----
As for `ndarray.tobytes`, information about the shape, dtype, etc.,
but also about `fill_value`, will be lost.
Examples
--------
>>> x = np.ma.array(np.array([[1, 2], [3, 4]]), mask=[[0, 1], [1, 0]])
>>> x.tobytes()
'\\x01\\x00\\x00\\x00?B\\x0f\\x00?B\\x0f\\x00\\x04\\x00\\x00\\x00'
"""
return self.filled(fill_value).tobytes(order=order)
def tofile(self, fid, sep="", format="%s"):
"""
Save a masked array to a file in binary format.
.. warning::
This function is not implemented yet.
Raises
------
NotImplementedError
When `tofile` is called.
"""
raise NotImplementedError("MaskedArray.tofile() not implemented yet.")
def toflex(self):
"""
Transforms a masked array into a flexible-type array.
The flexible type array that is returned will have two fields:
* the ``_data`` field stores the ``_data`` part of the array.
* the ``_mask`` field stores the ``_mask`` part of the array.
Parameters
----------
None
Returns
-------
record : ndarray
A new flexible-type `ndarray` with two fields: the first element
containing a value, the second element containing the corresponding
mask boolean. The returned record shape matches self.shape.
Notes
-----
A side-effect of transforming a masked array into a flexible `ndarray` is
that meta information (``fill_value``, ...) will be lost.
Examples
--------
>>> x = np.ma.array([[1,2,3],[4,5,6],[7,8,9]], mask=[0] + [1,0]*4)
>>> print(x)
[[1 -- 3]
[-- 5 --]
[7 -- 9]]
>>> print(x.toflex())
[[(1, False) (2, True) (3, False)]
[(4, True) (5, False) (6, True)]
[(7, False) (8, True) (9, False)]]
"""
# Get the basic dtype.
ddtype = self.dtype
# Make sure we have a mask
_mask = self._mask
if _mask is None:
_mask = make_mask_none(self.shape, ddtype)
# And get its dtype
mdtype = self._mask.dtype
record = np.ndarray(shape=self.shape,
dtype=[('_data', ddtype), ('_mask', mdtype)])
record['_data'] = self._data
record['_mask'] = self._mask
return record
torecords = toflex
# Pickling
def __getstate__(self):
"""Return the internal state of the masked array, for pickling
purposes.
"""
cf = 'CF'[self.flags.fnc]
data_state = super(MaskedArray, self).__reduce__()[2]
return data_state + (getmaskarray(self).tobytes(cf), self._fill_value)
def __setstate__(self, state):
"""Restore the internal state of the masked array, for
pickling purposes. ``state`` is typically the output of the
``__getstate__`` output, and is a 5-tuple:
- class name
- a tuple giving the shape of the data
- a typecode for the data
- a binary string for the data
- a binary string for the mask.
"""
(_, shp, typ, isf, raw, msk, flv) = state
super(MaskedArray, self).__setstate__((shp, typ, isf, raw))
self._mask.__setstate__((shp, make_mask_descr(typ), isf, msk))
self.fill_value = flv
def __reduce__(self):
"""Return a 3-tuple for pickling a MaskedArray.
"""
return (_mareconstruct,
(self.__class__, self._baseclass, (0,), 'b',),
self.__getstate__())
def __deepcopy__(self, memo=None):
from copy import deepcopy
copied = MaskedArray.__new__(type(self), self, copy=True)
if memo is None:
memo = {}
memo[id(self)] = copied
for (k, v) in self.__dict__.items():
copied.__dict__[k] = deepcopy(v, memo)
return copied
def _mareconstruct(subtype, baseclass, baseshape, basetype,):
"""Internal function that builds a new MaskedArray from the
information stored in a pickle.
"""
_data = ndarray.__new__(baseclass, baseshape, basetype)
_mask = ndarray.__new__(ndarray, baseshape, make_mask_descr(basetype))
return subtype.__new__(subtype, _data, mask=_mask, dtype=basetype,)
class mvoid(MaskedArray):
"""
Fake a 'void' object to use for masked array with structured dtypes.
"""
def __new__(self, data, mask=nomask, dtype=None, fill_value=None,
hardmask=False, copy=False, subok=True):
_data = np.array(data, copy=copy, subok=subok, dtype=dtype)
_data = _data.view(self)
_data._hardmask = hardmask
if mask is not nomask:
if isinstance(mask, np.void):
_data._mask = mask
else:
try:
# Mask is already a 0D array
_data._mask = np.void(mask)
except TypeError:
# Transform the mask to a void
mdtype = make_mask_descr(dtype)
_data._mask = np.array(mask, dtype=mdtype)[()]
if fill_value is not None:
_data.fill_value = fill_value
return _data
def _get_data(self):
# Make sure that the _data part is a np.void
return self.view(ndarray)[()]
_data = property(fget=_get_data)
def __getitem__(self, indx):
"""
Get the index.
"""
m = self._mask
if isinstance(m[indx], ndarray):
# Can happen when indx is a multi-dimensional field:
# A = ma.masked_array(data=[([0,1],)], mask=[([True,
# False],)], dtype=[("A", ">i2", (2,))])
# x = A[0]; y = x["A"]; then y.mask["A"].size==2
# and we can not say masked/unmasked.
# The result is no longer mvoid!
# See also issue #6724.
return masked_array(
data=self._data[indx], mask=m[indx],
fill_value=self._fill_value[indx],
hard_mask=self._hardmask)
if m is not nomask and m[indx]:
return masked
return self._data[indx]
def __setitem__(self, indx, value):
self._data[indx] = value
if self._hardmask:
self._mask[indx] |= getattr(value, "_mask", False)
else:
self._mask[indx] = getattr(value, "_mask", False)
def __str__(self):
m = self._mask
if m is nomask:
return self._data.__str__()
printopt = masked_print_option
rdtype = _replace_dtype_fields(self._data.dtype, "O")
# temporary hack to fix gh-7493. A more permanent fix
# is proposed in gh-6053, after which the next two
# lines should be changed to
# res = np.array([self._data], dtype=rdtype)
res = np.empty(1, rdtype)
res[:1] = self._data
_recursive_printoption(res, self._mask, printopt)
return str(res[0])
__repr__ = __str__
def __iter__(self):
"Defines an iterator for mvoid"
(_data, _mask) = (self._data, self._mask)
if _mask is nomask:
for d in _data:
yield d
else:
for (d, m) in zip(_data, _mask):
if m:
yield masked
else:
yield d
def __len__(self):
return self._data.__len__()
def filled(self, fill_value=None):
"""
Return a copy with masked fields filled with a given value.
Parameters
----------
fill_value : scalar, optional
The value to use for invalid entries (None by default).
If None, the `fill_value` attribute is used instead.
Returns
-------
filled_void
A `np.void` object
See Also
--------
MaskedArray.filled
"""
return asarray(self).filled(fill_value)[()]
def tolist(self):
"""
Transforms the mvoid object into a tuple.
Masked fields are replaced by None.
Returns
-------
returned_tuple
Tuple of fields
"""
_mask = self._mask
if _mask is nomask:
return self._data.tolist()
result = []
for (d, m) in zip(self._data, self._mask):
if m:
result.append(None)
else:
# .item() makes sure we return a standard Python object
result.append(d.item())
return tuple(result)
##############################################################################
# Shortcuts #
##############################################################################
def isMaskedArray(x):
"""
Test whether input is an instance of MaskedArray.
This function returns True if `x` is an instance of MaskedArray
and returns False otherwise. Any object is accepted as input.
Parameters
----------
x : object
Object to test.
Returns
-------
result : bool
True if `x` is a MaskedArray.
See Also
--------
isMA : Alias to isMaskedArray.
isarray : Alias to isMaskedArray.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.eye(3, 3)
>>> a
array([[ 1., 0., 0.],
[ 0., 1., 0.],
[ 0., 0., 1.]])
>>> m = ma.masked_values(a, 0)
>>> m
masked_array(data =
[[1.0 -- --]
[-- 1.0 --]
[-- -- 1.0]],
mask =
[[False True True]
[ True False True]
[ True True False]],
fill_value=0.0)
>>> ma.isMaskedArray(a)
False
>>> ma.isMaskedArray(m)
True
>>> ma.isMaskedArray([0, 1, 2])
False
"""
return isinstance(x, MaskedArray)
isarray = isMaskedArray
isMA = isMaskedArray # backward compatibility
class MaskedConstant(MaskedArray):
# We define the masked singleton as a float for higher precedence.
# Note that it can be tricky sometimes w/ type comparison
_data = data = np.array(0.)
_mask = mask = np.array(True)
_baseclass = ndarray
def __new__(self):
return self._data.view(self)
def __array_finalize__(self, obj):
return
def __array_prepare__(self, obj, context=None):
return self.view(MaskedArray).__array_prepare__(obj, context)
def __array_wrap__(self, obj, context=None):
return self.view(MaskedArray).__array_wrap__(obj, context)
def __str__(self):
return str(masked_print_option._display)
def __repr__(self):
return 'masked'
def flatten(self):
return masked_array([self._data], dtype=float, mask=[True])
def __reduce__(self):
"""Override of MaskedArray's __reduce__.
"""
return (self.__class__, ())
masked = masked_singleton = MaskedConstant()
masked_array = MaskedArray
def array(data, dtype=None, copy=False, order=None,
mask=nomask, fill_value=None, keep_mask=True,
hard_mask=False, shrink=True, subok=True, ndmin=0):
"""
Shortcut to MaskedArray.
The options are in a different order for convenience and backwards
compatibility.
"""
return MaskedArray(data, mask=mask, dtype=dtype, copy=copy,
subok=subok, keep_mask=keep_mask,
hard_mask=hard_mask, fill_value=fill_value,
ndmin=ndmin, shrink=shrink, order=order)
array.__doc__ = masked_array.__doc__
def is_masked(x):
"""
Determine whether input has masked values.
Accepts any object as input, but always returns False unless the
input is a MaskedArray containing masked values.
Parameters
----------
x : array_like
Array to check for masked values.
Returns
-------
result : bool
True if `x` is a MaskedArray with masked values, False otherwise.
Examples
--------
>>> import numpy.ma as ma
>>> x = ma.masked_equal([0, 1, 0, 2, 3], 0)
>>> x
masked_array(data = [-- 1 -- 2 3],
mask = [ True False True False False],
fill_value=999999)
>>> ma.is_masked(x)
True
>>> x = ma.masked_equal([0, 1, 0, 2, 3], 42)
>>> x
masked_array(data = [0 1 0 2 3],
mask = False,
fill_value=999999)
>>> ma.is_masked(x)
False
Always returns False if `x` isn't a MaskedArray.
>>> x = [False, True, False]
>>> ma.is_masked(x)
False
>>> x = 'a string'
>>> ma.is_masked(x)
False
"""
m = getmask(x)
if m is nomask:
return False
elif m.any():
return True
return False
##############################################################################
# Extrema functions #
##############################################################################
class _extrema_operation(object):
"""
Generic class for maximum/minimum functions.
.. note::
This is the base class for `_maximum_operation` and
`_minimum_operation`.
"""
def __init__(self, ufunc, compare, fill_value):
self.ufunc = ufunc
self.compare = compare
self.fill_value_func = fill_value
self.__doc__ = ufunc.__doc__
self.__name__ = ufunc.__name__
def __call__(self, a, b=None):
"Executes the call behavior."
if b is None:
# 2016-04-13, 1.13.0
warnings.warn(
"Single-argument form of np.ma.{0} is deprecated. Use "
"np.ma.{0}.reduce instead.".format(self.__name__),
DeprecationWarning, stacklevel=2)
return self.reduce(a)
return where(self.compare(a, b), a, b)
def reduce(self, target, axis=np._NoValue):
"Reduce target along the given axis."
target = narray(target, copy=False, subok=True)
m = getmask(target)
if axis is np._NoValue and target.ndim > 1:
# 2017-05-06, Numpy 1.13.0: warn on axis default
warnings.warn(
"In the future the default for ma.{0}.reduce will be axis=0, "
"not the current None, to match np.{0}.reduce. "
"Explicitly pass 0 or None to silence this warning.".format(
self.__name__
),
MaskedArrayFutureWarning, stacklevel=2)
axis = None
if axis is not np._NoValue:
kwargs = dict(axis=axis)
else:
kwargs = dict()
if m is nomask:
t = self.ufunc.reduce(target, **kwargs)
else:
target = target.filled(
self.fill_value_func(target)).view(type(target))
t = self.ufunc.reduce(target, **kwargs)
m = umath.logical_and.reduce(m, **kwargs)
if hasattr(t, '_mask'):
t._mask = m
elif m:
t = masked
return t
def outer(self, a, b):
"Return the function applied to the outer product of a and b."
ma = getmask(a)
mb = getmask(b)
if ma is nomask and mb is nomask:
m = nomask
else:
ma = getmaskarray(a)
mb = getmaskarray(b)
m = logical_or.outer(ma, mb)
result = self.ufunc.outer(filled(a), filled(b))
if not isinstance(result, MaskedArray):
result = result.view(MaskedArray)
result._mask = m
return result
def min(obj, axis=None, out=None, fill_value=None, keepdims=np._NoValue):
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
try:
return obj.min(axis=axis, fill_value=fill_value, out=out, **kwargs)
except (AttributeError, TypeError):
# If obj doesn't have a min method, or if the method doesn't accept a
# fill_value argument
return asanyarray(obj).min(axis=axis, fill_value=fill_value,
out=out, **kwargs)
min.__doc__ = MaskedArray.min.__doc__
def max(obj, axis=None, out=None, fill_value=None, keepdims=np._NoValue):
kwargs = {} if keepdims is np._NoValue else {'keepdims': keepdims}
try:
return obj.max(axis=axis, fill_value=fill_value, out=out, **kwargs)
except (AttributeError, TypeError):
# If obj doesn't have a max method, or if the method doesn't accept a
# fill_value argument
return asanyarray(obj).max(axis=axis, fill_value=fill_value,
out=out, **kwargs)
max.__doc__ = MaskedArray.max.__doc__
def ptp(obj, axis=None, out=None, fill_value=None):
"""
a.ptp(axis=None) = a.max(axis) - a.min(axis)
"""
try:
return obj.ptp(axis, out=out, fill_value=fill_value)
except (AttributeError, TypeError):
# If obj doesn't have a ptp method or if the method doesn't accept
# a fill_value argument
return asanyarray(obj).ptp(axis=axis, fill_value=fill_value, out=out)
ptp.__doc__ = MaskedArray.ptp.__doc__
##############################################################################
# Definition of functions from the corresponding methods #
##############################################################################
class _frommethod:
"""
Define functions from existing MaskedArray methods.
Parameters
----------
methodname : str
Name of the method to transform.
"""
def __init__(self, methodname, reversed=False):
self.__name__ = methodname
self.__doc__ = self.getdoc()
self.reversed = reversed
def getdoc(self):
"Return the doc of the function (from the doc of the method)."
meth = getattr(MaskedArray, self.__name__, None) or\
getattr(np, self.__name__, None)
signature = self.__name__ + get_object_signature(meth)
if meth is not None:
doc = """ %s\n%s""" % (
signature, getattr(meth, '__doc__', None))
return doc
def __call__(self, a, *args, **params):
if self.reversed:
args = list(args)
a, args[0] = args[0], a
marr = asanyarray(a)
method_name = self.__name__
method = getattr(type(marr), method_name, None)
if method is None:
# use the corresponding np function
method = getattr(np, method_name)
return method(marr, *args, **params)
all = _frommethod('all')
anomalies = anom = _frommethod('anom')
any = _frommethod('any')
compress = _frommethod('compress', reversed=True)
cumprod = _frommethod('cumprod')
cumsum = _frommethod('cumsum')
copy = _frommethod('copy')
diagonal = _frommethod('diagonal')
harden_mask = _frommethod('harden_mask')
ids = _frommethod('ids')
maximum = _extrema_operation(umath.maximum, greater, maximum_fill_value)
mean = _frommethod('mean')
minimum = _extrema_operation(umath.minimum, less, minimum_fill_value)
nonzero = _frommethod('nonzero')
prod = _frommethod('prod')
product = _frommethod('prod')
ravel = _frommethod('ravel')
repeat = _frommethod('repeat')
shrink_mask = _frommethod('shrink_mask')
soften_mask = _frommethod('soften_mask')
std = _frommethod('std')
sum = _frommethod('sum')
swapaxes = _frommethod('swapaxes')
#take = _frommethod('take')
trace = _frommethod('trace')
var = _frommethod('var')
count = _frommethod('count')
def take(a, indices, axis=None, out=None, mode='raise'):
"""
"""
a = masked_array(a)
return a.take(indices, axis=axis, out=out, mode=mode)
def power(a, b, third=None):
"""
Returns element-wise base array raised to power from second array.
This is the masked array version of `numpy.power`. For details see
`numpy.power`.
See Also
--------
numpy.power
Notes
-----
The *out* argument to `numpy.power` is not supported, `third` has to be
None.
"""
if third is not None:
raise MaskError("3-argument power not supported.")
# Get the masks
ma = getmask(a)
mb = getmask(b)
m = mask_or(ma, mb)
# Get the rawdata
fa = getdata(a)
fb = getdata(b)
# Get the type of the result (so that we preserve subclasses)
if isinstance(a, MaskedArray):
basetype = type(a)
else:
basetype = MaskedArray
# Get the result and view it as a (subclass of) MaskedArray
with np.errstate(divide='ignore', invalid='ignore'):
result = np.where(m, fa, umath.power(fa, fb)).view(basetype)
result._update_from(a)
# Find where we're in trouble w/ NaNs and Infs
invalid = np.logical_not(np.isfinite(result.view(ndarray)))
# Add the initial mask
if m is not nomask:
if not (result.ndim):
return masked
result._mask = np.logical_or(m, invalid)
# Fix the invalid parts
if invalid.any():
if not result.ndim:
return masked
elif result._mask is nomask:
result._mask = invalid
result._data[invalid] = result.fill_value
return result
argmin = _frommethod('argmin')
argmax = _frommethod('argmax')
def argsort(a, axis=np._NoValue, kind='quicksort', order=None, endwith=True, fill_value=None):
"Function version of the eponymous method."
a = np.asanyarray(a)
# 2017-04-11, Numpy 1.13.0, gh-8701: warn on axis default
if axis is np._NoValue:
axis = _deprecate_argsort_axis(a)
if isinstance(a, MaskedArray):
return a.argsort(axis=axis, kind=kind, order=order,
endwith=endwith, fill_value=fill_value)
else:
return a.argsort(axis=axis, kind=kind, order=order)
argsort.__doc__ = MaskedArray.argsort.__doc__
def sort(a, axis=-1, kind='quicksort', order=None, endwith=True, fill_value=None):
"Function version of the eponymous method."
a = np.array(a, copy=True, subok=True)
if axis is None:
a = a.flatten()
axis = 0
if isinstance(a, MaskedArray):
a.sort(axis=axis, kind=kind, order=order,
endwith=endwith, fill_value=fill_value)
else:
a.sort(axis=axis, kind=kind, order=order)
return a
sort.__doc__ = MaskedArray.sort.__doc__
def compressed(x):
"""
Return all the non-masked data as a 1-D array.
This function is equivalent to calling the "compressed" method of a
`MaskedArray`, see `MaskedArray.compressed` for details.
See Also
--------
MaskedArray.compressed
Equivalent method.
"""
return asanyarray(x).compressed()
def concatenate(arrays, axis=0):
"""
Concatenate a sequence of arrays along the given axis.
Parameters
----------
arrays : sequence of array_like
The arrays must have the same shape, except in the dimension
corresponding to `axis` (the first, by default).
axis : int, optional
The axis along which the arrays will be joined. Default is 0.
Returns
-------
result : MaskedArray
The concatenated array with any masked entries preserved.
See Also
--------
numpy.concatenate : Equivalent function in the top-level NumPy module.
Examples
--------
>>> import numpy.ma as ma
>>> a = ma.arange(3)
>>> a[1] = ma.masked
>>> b = ma.arange(2, 5)
>>> a
masked_array(data = [0 -- 2],
mask = [False True False],
fill_value = 999999)
>>> b
masked_array(data = [2 3 4],
mask = False,
fill_value = 999999)
>>> ma.concatenate([a, b])
masked_array(data = [0 -- 2 2 3 4],
mask = [False True False False False False],
fill_value = 999999)
"""
d = np.concatenate([getdata(a) for a in arrays], axis)
rcls = get_masked_subclass(*arrays)
data = d.view(rcls)
# Check whether one of the arrays has a non-empty mask.
for x in arrays:
if getmask(x) is not nomask:
break
else:
return data
# OK, so we have to concatenate the masks
dm = np.concatenate([getmaskarray(a) for a in arrays], axis)
# If we decide to keep a '_shrinkmask' option, we want to check that
# all of them are True, and then check for dm.any()
if not dm.dtype.fields and not dm.any():
data._mask = nomask
else:
data._mask = dm.reshape(d.shape)
return data
def diag(v, k=0):
"""
Extract a diagonal or construct a diagonal array.
This function is the equivalent of `numpy.diag` that takes masked
values into account, see `numpy.diag` for details.
See Also
--------
numpy.diag : Equivalent function for ndarrays.
"""
output = np.diag(v, k).view(MaskedArray)
if getmask(v) is not nomask:
output._mask = np.diag(v._mask, k)
return output
def expand_dims(x, axis):
"""
Expand the shape of an array.
Expands the shape of the array by including a new axis before the one
specified by the `axis` parameter. This function behaves the same as
`numpy.expand_dims` but preserves masked elements.
See Also
--------
numpy.expand_dims : Equivalent function in top-level NumPy module.
Examples
--------
>>> import numpy.ma as ma
>>> x = ma.array([1, 2, 4])
>>> x[1] = ma.masked
>>> x
masked_array(data = [1 -- 4],
mask = [False True False],
fill_value = 999999)
>>> np.expand_dims(x, axis=0)
array([[1, 2, 4]])
>>> ma.expand_dims(x, axis=0)
masked_array(data =
[[1 -- 4]],
mask =
[[False True False]],
fill_value = 999999)
The same result can be achieved using slicing syntax with `np.newaxis`.
>>> x[np.newaxis, :]
masked_array(data =
[[1 -- 4]],
mask =
[[False True False]],
fill_value = 999999)
"""
result = n_expand_dims(x, axis)
if isinstance(x, MaskedArray):
new_shape = result.shape
result = x.view()
result.shape = new_shape
if result._mask is not nomask:
result._mask.shape = new_shape
return result
def left_shift(a, n):
"""
Shift the bits of an integer to the left.
This is the masked array version of `numpy.left_shift`, for details
see that function.
See Also
--------
numpy.left_shift
"""
m = getmask(a)
if m is nomask:
d = umath.left_shift(filled(a), n)
return masked_array(d)
else:
d = umath.left_shift(filled(a, 0), n)
return masked_array(d, mask=m)
def right_shift(a, n):
"""
Shift the bits of an integer to the right.
This is the masked array version of `numpy.right_shift`, for details
see that function.
See Also
--------
numpy.right_shift
"""
m = getmask(a)
if m is nomask:
d = umath.right_shift(filled(a), n)
return masked_array(d)
else:
d = umath.right_shift(filled(a, 0), n)
return masked_array(d, mask=m)
def put(a, indices, values, mode='raise'):
"""
Set storage-indexed locations to corresponding values.
This function is equivalent to `MaskedArray.put`, see that method
for details.
See Also
--------
MaskedArray.put
"""
# We can't use 'frommethod', the order of arguments is different
try:
return a.put(indices, values, mode=mode)
except AttributeError:
return narray(a, copy=False).put(indices, values, mode=mode)
def putmask(a, mask, values): # , mode='raise'):
"""
Changes elements of an array based on conditional and input values.
This is the masked array version of `numpy.putmask`, for details see
`numpy.putmask`.
See Also
--------
numpy.putmask
Notes
-----
Using a masked array as `values` will **not** transform a `ndarray` into
a `MaskedArray`.
"""
# We can't use 'frommethod', the order of arguments is different
if not isinstance(a, MaskedArray):
a = a.view(MaskedArray)
(valdata, valmask) = (getdata(values), getmask(values))
if getmask(a) is nomask:
if valmask is not nomask:
a._sharedmask = True
a._mask = make_mask_none(a.shape, a.dtype)
np.copyto(a._mask, valmask, where=mask)
elif a._hardmask:
if valmask is not nomask:
m = a._mask.copy()
np.copyto(m, valmask, where=mask)
a.mask |= m
else:
if valmask is nomask:
valmask = getmaskarray(values)
np.copyto(a._mask, valmask, where=mask)
np.copyto(a._data, valdata, where=mask)
return
def transpose(a, axes=None):
"""
Permute the dimensions of an array.
This function is exactly equivalent to `numpy.transpose`.
See Also
--------
numpy.transpose : Equivalent function in top-level NumPy module.
Examples
--------
>>> import numpy.ma as ma
>>> x = ma.arange(4).reshape((2,2))
>>> x[1, 1] = ma.masked
>>>> x
masked_array(data =
[[0 1]
[2 --]],
mask =
[[False False]
[False True]],
fill_value = 999999)
>>> ma.transpose(x)
masked_array(data =
[[0 2]
[1 --]],
mask =
[[False False]
[False True]],
fill_value = 999999)
"""
# We can't use 'frommethod', as 'transpose' doesn't take keywords
try:
return a.transpose(axes)
except AttributeError:
return narray(a, copy=False).transpose(axes).view(MaskedArray)
def reshape(a, new_shape, order='C'):
"""
Returns an array containing the same data with a new shape.
Refer to `MaskedArray.reshape` for full documentation.
See Also
--------
MaskedArray.reshape : equivalent function
"""
# We can't use 'frommethod', it whine about some parameters. Dmmit.
try:
return a.reshape(new_shape, order=order)
except AttributeError:
_tmp = narray(a, copy=False).reshape(new_shape, order=order)
return _tmp.view(MaskedArray)
def resize(x, new_shape):
"""
Return a new masked array with the specified size and shape.
This is the masked equivalent of the `numpy.resize` function. The new
array is filled with repeated copies of `x` (in the order that the
data are stored in memory). If `x` is masked, the new array will be
masked, and the new mask will be a repetition of the old one.
See Also
--------
numpy.resize : Equivalent function in the top level NumPy module.
Examples
--------
>>> import numpy.ma as ma
>>> a = ma.array([[1, 2] ,[3, 4]])
>>> a[0, 1] = ma.masked
>>> a
masked_array(data =
[[1 --]
[3 4]],
mask =
[[False True]
[False False]],
fill_value = 999999)
>>> np.resize(a, (3, 3))
array([[1, 2, 3],
[4, 1, 2],
[3, 4, 1]])
>>> ma.resize(a, (3, 3))
masked_array(data =
[[1 -- 3]
[4 1 --]
[3 4 1]],
mask =
[[False True False]
[False False True]
[False False False]],
fill_value = 999999)
A MaskedArray is always returned, regardless of the input type.
>>> a = np.array([[1, 2] ,[3, 4]])
>>> ma.resize(a, (3, 3))
masked_array(data =
[[1 2 3]
[4 1 2]
[3 4 1]],
mask =
False,
fill_value = 999999)
"""
# We can't use _frommethods here, as N.resize is notoriously whiny.
m = getmask(x)
if m is not nomask:
m = np.resize(m, new_shape)
result = np.resize(x, new_shape).view(get_masked_subclass(x))
if result.ndim:
result._mask = m
return result
def rank(obj):
"""
maskedarray version of the numpy function.
.. note::
Deprecated since 1.10.0
"""
# 2015-04-12, 1.10.0
warnings.warn(
"`rank` is deprecated; use the `ndim` function instead. ",
np.VisibleDeprecationWarning, stacklevel=2)
return np.ndim(getdata(obj))
rank.__doc__ = np.rank.__doc__
def ndim(obj):
"""
maskedarray version of the numpy function.
"""
return np.ndim(getdata(obj))
ndim.__doc__ = np.ndim.__doc__
def shape(obj):
"maskedarray version of the numpy function."
return np.shape(getdata(obj))
shape.__doc__ = np.shape.__doc__
def size(obj, axis=None):
"maskedarray version of the numpy function."
return np.size(getdata(obj), axis)
size.__doc__ = np.size.__doc__
##############################################################################
# Extra functions #
##############################################################################
def where(condition, x=_NoValue, y=_NoValue):
"""
Return a masked array with elements from x or y, depending on condition.
Returns a masked array, shaped like condition, where the elements
are from `x` when `condition` is True, and from `y` otherwise.
If neither `x` nor `y` are given, the function returns a tuple of
indices where `condition` is True (the result of
``condition.nonzero()``).
Parameters
----------
condition : array_like, bool
The condition to meet. For each True element, yield the corresponding
element from `x`, otherwise from `y`.
x, y : array_like, optional
Values from which to choose. `x`, `y` and `condition` need to be
broadcastable to some shape.
Returns
-------
out : MaskedArray or tuple of ndarrays
The resulting masked array if `x` and `y` were given, otherwise
the result of ``condition.nonzero()``.
See Also
--------
numpy.where : Equivalent function in the top-level NumPy module.
Examples
--------
>>> x = np.ma.array(np.arange(9.).reshape(3, 3), mask=[[0, 1, 0],
... [1, 0, 1],
... [0, 1, 0]])
>>> print(x)
[[0.0 -- 2.0]
[-- 4.0 --]
[6.0 -- 8.0]]
>>> np.ma.where(x > 5) # return the indices where x > 5
(array([2, 2]), array([0, 2]))
>>> print(np.ma.where(x > 5, x, -3.1416))
[[-3.1416 -- -3.1416]
[-- -3.1416 --]
[6.0 -- 8.0]]
"""
# handle the single-argument case
missing = (x is _NoValue, y is _NoValue).count(True)
if missing == 1:
raise ValueError("Must provide both 'x' and 'y' or neither.")
if missing == 2:
return nonzero(condition)
# we only care if the condition is true - false or masked pick y
cf = filled(condition, False)
xd = getdata(x)
yd = getdata(y)
# we need the full arrays here for correct final dimensions
cm = getmaskarray(condition)
xm = getmaskarray(x)
ym = getmaskarray(y)
# deal with the fact that masked.dtype == float64, but we don't actually
# want to treat it as that.
if x is masked and y is not masked:
xd = np.zeros((), dtype=yd.dtype)
xm = np.ones((), dtype=ym.dtype)
elif y is masked and x is not masked:
yd = np.zeros((), dtype=xd.dtype)
ym = np.ones((), dtype=xm.dtype)
data = np.where(cf, xd, yd)
mask = np.where(cf, xm, ym)
mask = np.where(cm, np.ones((), dtype=mask.dtype), mask)
# collapse the mask, for backwards compatibility
if mask.dtype == np.bool_ and not mask.any():
mask = nomask
return masked_array(data, mask=mask)
def choose(indices, choices, out=None, mode='raise'):
"""
Use an index array to construct a new array from a set of choices.
Given an array of integers and a set of n choice arrays, this method
will create a new array that merges each of the choice arrays. Where a
value in `a` is i, the new array will have the value that choices[i]
contains in the same place.
Parameters
----------
a : ndarray of ints
This array must contain integers in ``[0, n-1]``, where n is the
number of choices.
choices : sequence of arrays
Choice arrays. The index array and all of the choices should be
broadcastable to the same shape.
out : array, optional
If provided, the result will be inserted into this array. It should
be of the appropriate shape and `dtype`.
mode : {'raise', 'wrap', 'clip'}, optional
Specifies how out-of-bounds indices will behave.
* 'raise' : raise an error
* 'wrap' : wrap around
* 'clip' : clip to the range
Returns
-------
merged_array : array
See Also
--------
choose : equivalent function
Examples
--------
>>> choice = np.array([[1,1,1], [2,2,2], [3,3,3]])
>>> a = np.array([2, 1, 0])
>>> np.ma.choose(a, choice)
masked_array(data = [3 2 1],
mask = False,
fill_value=999999)
"""
def fmask(x):
"Returns the filled array, or True if masked."
if x is masked:
return True
return filled(x)
def nmask(x):
"Returns the mask, True if ``masked``, False if ``nomask``."
if x is masked:
return True
return getmask(x)
# Get the indices.
c = filled(indices, 0)
# Get the masks.
masks = [nmask(x) for x in choices]
data = [fmask(x) for x in choices]
# Construct the mask
outputmask = np.choose(c, masks, mode=mode)
outputmask = make_mask(mask_or(outputmask, getmask(indices)),
copy=0, shrink=True)
# Get the choices.
d = np.choose(c, data, mode=mode, out=out).view(MaskedArray)
if out is not None:
if isinstance(out, MaskedArray):
out.__setmask__(outputmask)
return out
d.__setmask__(outputmask)
return d
def round_(a, decimals=0, out=None):
"""
Return a copy of a, rounded to 'decimals' places.
When 'decimals' is negative, it specifies the number of positions
to the left of the decimal point. The real and imaginary parts of
complex numbers are rounded separately. Nothing is done if the
array is not of float type and 'decimals' is greater than or equal
to 0.
Parameters
----------
decimals : int
Number of decimals to round to. May be negative.
out : array_like
Existing array to use for output.
If not given, returns a default copy of a.
Notes
-----
If out is given and does not have a mask attribute, the mask of a
is lost!
"""
if out is None:
return np.round_(a, decimals, out)
else:
np.round_(getdata(a), decimals, out)
if hasattr(out, '_mask'):
out._mask = getmask(a)
return out
round = round_
# Needed by dot, so move here from extras.py. It will still be exported
# from extras.py for compatibility.
def mask_rowcols(a, axis=None):
"""
Mask rows and/or columns of a 2D array that contain masked values.
Mask whole rows and/or columns of a 2D array that contain
masked values. The masking behavior is selected using the
`axis` parameter.
- If `axis` is None, rows *and* columns are masked.
- If `axis` is 0, only rows are masked.
- If `axis` is 1 or -1, only columns are masked.
Parameters
----------
a : array_like, MaskedArray
The array to mask. If not a MaskedArray instance (or if no array
elements are masked). The result is a MaskedArray with `mask` set
to `nomask` (False). Must be a 2D array.
axis : int, optional
Axis along which to perform the operation. If None, applies to a
flattened version of the array.
Returns
-------
a : MaskedArray
A modified version of the input array, masked depending on the value
of the `axis` parameter.
Raises
------
NotImplementedError
If input array `a` is not 2D.
See Also
--------
mask_rows : Mask rows of a 2D array that contain masked values.
mask_cols : Mask cols of a 2D array that contain masked values.
masked_where : Mask where a condition is met.
Notes
-----
The input array's mask is modified by this function.
Examples
--------
>>> import numpy.ma as ma
>>> a = np.zeros((3, 3), dtype=np.int)
>>> a[1, 1] = 1
>>> a
array([[0, 0, 0],
[0, 1, 0],
[0, 0, 0]])
>>> a = ma.masked_equal(a, 1)
>>> a
masked_array(data =
[[0 0 0]
[0 -- 0]
[0 0 0]],
mask =
[[False False False]
[False True False]
[False False False]],
fill_value=999999)
>>> ma.mask_rowcols(a)
masked_array(data =
[[0 -- 0]
[-- -- --]
[0 -- 0]],
mask =
[[False True False]
[ True True True]
[False True False]],
fill_value=999999)
"""
a = array(a, subok=False)
if a.ndim != 2:
raise NotImplementedError("mask_rowcols works for 2D arrays only.")
m = getmask(a)
# Nothing is masked: return a
if m is nomask or not m.any():
return a
maskedval = m.nonzero()
a._mask = a._mask.copy()
if not axis:
a[np.unique(maskedval[0])] = masked
if axis in [None, 1, -1]:
a[:, np.unique(maskedval[1])] = masked
return a
# Include masked dot here to avoid import problems in getting it from
# extras.py. Note that it is not included in __all__, but rather exported
# from extras in order to avoid backward compatibility problems.
def dot(a, b, strict=False, out=None):
"""
Return the dot product of two arrays.
This function is the equivalent of `numpy.dot` that takes masked values
into account. Note that `strict` and `out` are in different position
than in the method version. In order to maintain compatibility with the
corresponding method, it is recommended that the optional arguments be
treated as keyword only. At some point that may be mandatory.
.. note::
Works only with 2-D arrays at the moment.
Parameters
----------
a, b : masked_array_like
Inputs arrays.
strict : bool, optional
Whether masked data are propagated (True) or set to 0 (False) for
the computation. Default is False. Propagating the mask means that
if a masked value appears in a row or column, the whole row or
column is considered masked.
out : masked_array, optional
Output argument. This must have the exact kind that would be returned
if it was not used. In particular, it must have the right type, must be
C-contiguous, and its dtype must be the dtype that would be returned
for `dot(a,b)`. This is a performance feature. Therefore, if these
conditions are not met, an exception is raised, instead of attempting
to be flexible.
.. versionadded:: 1.10.2
See Also
--------
numpy.dot : Equivalent function for ndarrays.
Examples
--------
>>> a = ma.array([[1, 2, 3], [4, 5, 6]], mask=[[1, 0, 0], [0, 0, 0]])
>>> b = ma.array([[1, 2], [3, 4], [5, 6]], mask=[[1, 0], [0, 0], [0, 0]])
>>> np.ma.dot(a, b)
masked_array(data =
[[21 26]
[45 64]],
mask =
[[False False]
[False False]],
fill_value = 999999)
>>> np.ma.dot(a, b, strict=True)
masked_array(data =
[[-- --]
[-- 64]],
mask =
[[ True True]
[ True False]],
fill_value = 999999)
"""
# !!!: Works only with 2D arrays. There should be a way to get it to run
# with higher dimension
if strict and (a.ndim == 2) and (b.ndim == 2):
a = mask_rowcols(a, 0)
b = mask_rowcols(b, 1)
am = ~getmaskarray(a)
bm = ~getmaskarray(b)
if out is None:
d = np.dot(filled(a, 0), filled(b, 0))
m = ~np.dot(am, bm)
if d.ndim == 0:
d = np.asarray(d)
r = d.view(get_masked_subclass(a, b))
r.__setmask__(m)
return r
else:
d = np.dot(filled(a, 0), filled(b, 0), out._data)
if out.mask.shape != d.shape:
out._mask = np.empty(d.shape, MaskType)
np.dot(am, bm, out._mask)
np.logical_not(out._mask, out._mask)
return out
def inner(a, b):
"""
Returns the inner product of a and b for arrays of floating point types.
Like the generic NumPy equivalent the product sum is over the last dimension
of a and b.
Notes
-----
The first argument is not conjugated.
"""
fa = filled(a, 0)
fb = filled(b, 0)
if fa.ndim == 0:
fa.shape = (1,)
if fb.ndim == 0:
fb.shape = (1,)
return np.inner(fa, fb).view(MaskedArray)
inner.__doc__ = doc_note(np.inner.__doc__,
"Masked values are replaced by 0.")
innerproduct = inner
def outer(a, b):
"maskedarray version of the numpy function."
fa = filled(a, 0).ravel()
fb = filled(b, 0).ravel()
d = np.outer(fa, fb)
ma = getmask(a)
mb = getmask(b)
if ma is nomask and mb is nomask:
return masked_array(d)
ma = getmaskarray(a)
mb = getmaskarray(b)
m = make_mask(1 - np.outer(1 - ma, 1 - mb), copy=0)
return masked_array(d, mask=m)
outer.__doc__ = doc_note(np.outer.__doc__,
"Masked values are replaced by 0.")
outerproduct = outer
def _convolve_or_correlate(f, a, v, mode, propagate_mask):
"""
Helper function for ma.correlate and ma.convolve
"""
if propagate_mask:
# results which are contributed to by either item in any pair being invalid
mask = (
f(getmaskarray(a), np.ones(np.shape(v), dtype=np.bool), mode=mode)
| f(np.ones(np.shape(a), dtype=np.bool), getmaskarray(v), mode=mode)
)
data = f(getdata(a), getdata(v), mode=mode)
else:
# results which are not contributed to by any pair of valid elements
mask = ~f(~getmaskarray(a), ~getmaskarray(v))
data = f(filled(a, 0), filled(v, 0), mode=mode)
return masked_array(data, mask=mask)
def correlate(a, v, mode='valid', propagate_mask=True):
"""
Cross-correlation of two 1-dimensional sequences.
Parameters
----------
a, v : array_like
Input sequences.
mode : {'valid', 'same', 'full'}, optional
Refer to the `np.convolve` docstring. Note that the default
is 'valid', unlike `convolve`, which uses 'full'.
propagate_mask : bool
If True, then a result element is masked if any masked element contributes towards it.
If False, then a result element is only masked if no non-masked element
contribute towards it
Returns
-------
out : MaskedArray
Discrete cross-correlation of `a` and `v`.
See Also
--------
numpy.correlate : Equivalent function in the top-level NumPy module.
"""
return _convolve_or_correlate(np.correlate, a, v, mode, propagate_mask)
def convolve(a, v, mode='full', propagate_mask=True):
"""
Returns the discrete, linear convolution of two one-dimensional sequences.
Parameters
----------
a, v : array_like
Input sequences.
mode : {'valid', 'same', 'full'}, optional
Refer to the `np.convolve` docstring.
propagate_mask : bool
If True, then if any masked element is included in the sum for a result
element, then the result is masked.
If False, then the result element is only masked if no non-masked cells
contribute towards it
Returns
-------
out : MaskedArray
Discrete, linear convolution of `a` and `v`.
See Also
--------
numpy.convolve : Equivalent function in the top-level NumPy module.
"""
return _convolve_or_correlate(np.convolve, a, v, mode, propagate_mask)
def allequal(a, b, fill_value=True):
"""
Return True if all entries of a and b are equal, using
fill_value as a truth value where either or both are masked.
Parameters
----------
a, b : array_like
Input arrays to compare.
fill_value : bool, optional
Whether masked values in a or b are considered equal (True) or not
(False).
Returns
-------
y : bool
Returns True if the two arrays are equal within the given
tolerance, False otherwise. If either array contains NaN,
then False is returned.
See Also
--------
all, any
numpy.ma.allclose
Examples
--------
>>> a = ma.array([1e10, 1e-7, 42.0], mask=[0, 0, 1])
>>> a
masked_array(data = [10000000000.0 1e-07 --],
mask = [False False True],
fill_value=1e+20)
>>> b = array([1e10, 1e-7, -42.0])
>>> b
array([ 1.00000000e+10, 1.00000000e-07, -4.20000000e+01])
>>> ma.allequal(a, b, fill_value=False)
False
>>> ma.allequal(a, b)
True
"""
m = mask_or(getmask(a), getmask(b))
if m is nomask:
x = getdata(a)
y = getdata(b)
d = umath.equal(x, y)
return d.all()
elif fill_value:
x = getdata(a)
y = getdata(b)
d = umath.equal(x, y)
dm = array(d, mask=m, copy=False)
return dm.filled(True).all(None)
else:
return False
def allclose(a, b, masked_equal=True, rtol=1e-5, atol=1e-8):
"""
Returns True if two arrays are element-wise equal within a tolerance.
This function is equivalent to `allclose` except that masked values
are treated as equal (default) or unequal, depending on the `masked_equal`
argument.
Parameters
----------
a, b : array_like
Input arrays to compare.
masked_equal : bool, optional
Whether masked values in `a` and `b` are considered equal (True) or not
(False). They are considered equal by default.
rtol : float, optional
Relative tolerance. The relative difference is equal to ``rtol * b``.
Default is 1e-5.
atol : float, optional
Absolute tolerance. The absolute difference is equal to `atol`.
Default is 1e-8.
Returns
-------
y : bool
Returns True if the two arrays are equal within the given
tolerance, False otherwise. If either array contains NaN, then
False is returned.
See Also
--------
all, any
numpy.allclose : the non-masked `allclose`.
Notes
-----
If the following equation is element-wise True, then `allclose` returns
True::
absolute(`a` - `b`) <= (`atol` + `rtol` * absolute(`b`))
Return True if all elements of `a` and `b` are equal subject to
given tolerances.
Examples
--------
>>> a = ma.array([1e10, 1e-7, 42.0], mask=[0, 0, 1])
>>> a
masked_array(data = [10000000000.0 1e-07 --],
mask = [False False True],
fill_value = 1e+20)
>>> b = ma.array([1e10, 1e-8, -42.0], mask=[0, 0, 1])
>>> ma.allclose(a, b)
False
>>> a = ma.array([1e10, 1e-8, 42.0], mask=[0, 0, 1])
>>> b = ma.array([1.00001e10, 1e-9, -42.0], mask=[0, 0, 1])
>>> ma.allclose(a, b)
True
>>> ma.allclose(a, b, masked_equal=False)
False
Masked values are not compared directly.
>>> a = ma.array([1e10, 1e-8, 42.0], mask=[0, 0, 1])
>>> b = ma.array([1.00001e10, 1e-9, 42.0], mask=[0, 0, 1])
>>> ma.allclose(a, b)
True
>>> ma.allclose(a, b, masked_equal=False)
False
"""
x = masked_array(a, copy=False)
y = masked_array(b, copy=False)
# make sure y is an inexact type to avoid abs(MIN_INT); will cause
# casting of x later.
dtype = np.result_type(y, 1.)
if y.dtype != dtype:
y = masked_array(y, dtype=dtype, copy=False)
m = mask_or(getmask(x), getmask(y))
xinf = np.isinf(masked_array(x, copy=False, mask=m)).filled(False)
# If we have some infs, they should fall at the same place.
if not np.all(xinf == filled(np.isinf(y), False)):
return False
# No infs at all
if not np.any(xinf):
d = filled(less_equal(absolute(x - y), atol + rtol * absolute(y)),
masked_equal)
return np.all(d)
if not np.all(filled(x[xinf] == y[xinf], masked_equal)):
return False
x = x[~xinf]
y = y[~xinf]
d = filled(less_equal(absolute(x - y), atol + rtol * absolute(y)),
masked_equal)
return np.all(d)
def asarray(a, dtype=None, order=None):
"""
Convert the input to a masked array of the given data-type.
No copy is performed if the input is already an `ndarray`. If `a` is
a subclass of `MaskedArray`, a base class `MaskedArray` is returned.
Parameters
----------
a : array_like
Input data, in any form that can be converted to a masked array. This
includes lists, lists of tuples, tuples, tuples of tuples, tuples
of lists, ndarrays and masked arrays.
dtype : dtype, optional
By default, the data-type is inferred from the input data.
order : {'C', 'F'}, optional
Whether to use row-major ('C') or column-major ('FORTRAN') memory
representation. Default is 'C'.
Returns
-------
out : MaskedArray
Masked array interpretation of `a`.
See Also
--------
asanyarray : Similar to `asarray`, but conserves subclasses.
Examples
--------
>>> x = np.arange(10.).reshape(2, 5)
>>> x
array([[ 0., 1., 2., 3., 4.],
[ 5., 6., 7., 8., 9.]])
>>> np.ma.asarray(x)
masked_array(data =
[[ 0. 1. 2. 3. 4.]
[ 5. 6. 7. 8. 9.]],
mask =
False,
fill_value = 1e+20)
>>> type(np.ma.asarray(x))
<class 'numpy.ma.core.MaskedArray'>
"""
order = order or 'C'
return masked_array(a, dtype=dtype, copy=False, keep_mask=True,
subok=False, order=order)
def asanyarray(a, dtype=None):
"""
Convert the input to a masked array, conserving subclasses.
If `a` is a subclass of `MaskedArray`, its class is conserved.
No copy is performed if the input is already an `ndarray`.
Parameters
----------
a : array_like
Input data, in any form that can be converted to an array.
dtype : dtype, optional
By default, the data-type is inferred from the input data.
order : {'C', 'F'}, optional
Whether to use row-major ('C') or column-major ('FORTRAN') memory
representation. Default is 'C'.
Returns
-------
out : MaskedArray
MaskedArray interpretation of `a`.
See Also
--------
asarray : Similar to `asanyarray`, but does not conserve subclass.
Examples
--------
>>> x = np.arange(10.).reshape(2, 5)
>>> x
array([[ 0., 1., 2., 3., 4.],
[ 5., 6., 7., 8., 9.]])
>>> np.ma.asanyarray(x)
masked_array(data =
[[ 0. 1. 2. 3. 4.]
[ 5. 6. 7. 8. 9.]],
mask =
False,
fill_value = 1e+20)
>>> type(np.ma.asanyarray(x))
<class 'numpy.ma.core.MaskedArray'>
"""
# workaround for #8666, to preserve identity. Ideally the bottom line
# would handle this for us.
if isinstance(a, MaskedArray) and (dtype is None or dtype == a.dtype):
return a
return masked_array(a, dtype=dtype, copy=False, keep_mask=True, subok=True)
##############################################################################
# Pickling #
##############################################################################
def dump(a, F):
"""
Pickle a masked array to a file.
This is a wrapper around ``cPickle.dump``.
Parameters
----------
a : MaskedArray
The array to be pickled.
F : str or file-like object
The file to pickle `a` to. If a string, the full path to the file.
"""
if not hasattr(F, 'readline'):
F = open(F, 'w')
return pickle.dump(a, F)
def dumps(a):
"""
Return a string corresponding to the pickling of a masked array.
This is a wrapper around ``cPickle.dumps``.
Parameters
----------
a : MaskedArray
The array for which the string representation of the pickle is
returned.
"""
return pickle.dumps(a)
def load(F):
"""
Wrapper around ``cPickle.load`` which accepts either a file-like object
or a filename.
Parameters
----------
F : str or file
The file or file name to load.
See Also
--------
dump : Pickle an array
Notes
-----
This is different from `numpy.load`, which does not use cPickle but loads
the NumPy binary .npy format.
"""
if not hasattr(F, 'readline'):
F = open(F, 'r')
return pickle.load(F)
def loads(strg):
"""
Load a pickle from the current string.
The result of ``cPickle.loads(strg)`` is returned.
Parameters
----------
strg : str
The string to load.
See Also
--------
dumps : Return a string corresponding to the pickling of a masked array.
"""
return pickle.loads(strg)
def fromfile(file, dtype=float, count=-1, sep=''):
raise NotImplementedError(
"fromfile() not yet implemented for a MaskedArray.")
def fromflex(fxarray):
"""
Build a masked array from a suitable flexible-type array.
The input array has to have a data-type with ``_data`` and ``_mask``
fields. This type of array is output by `MaskedArray.toflex`.
Parameters
----------
fxarray : ndarray
The structured input array, containing ``_data`` and ``_mask``
fields. If present, other fields are discarded.
Returns
-------
result : MaskedArray
The constructed masked array.
See Also
--------
MaskedArray.toflex : Build a flexible-type array from a masked array.
Examples
--------
>>> x = np.ma.array(np.arange(9).reshape(3, 3), mask=[0] + [1, 0] * 4)
>>> rec = x.toflex()
>>> rec
array([[(0, False), (1, True), (2, False)],
[(3, True), (4, False), (5, True)],
[(6, False), (7, True), (8, False)]],
dtype=[('_data', '<i4'), ('_mask', '|b1')])
>>> x2 = np.ma.fromflex(rec)
>>> x2
masked_array(data =
[[0 -- 2]
[-- 4 --]
[6 -- 8]],
mask =
[[False True False]
[ True False True]
[False True False]],
fill_value = 999999)
Extra fields can be present in the structured array but are discarded:
>>> dt = [('_data', '<i4'), ('_mask', '|b1'), ('field3', '<f4')]
>>> rec2 = np.zeros((2, 2), dtype=dt)
>>> rec2
array([[(0, False, 0.0), (0, False, 0.0)],
[(0, False, 0.0), (0, False, 0.0)]],
dtype=[('_data', '<i4'), ('_mask', '|b1'), ('field3', '<f4')])
>>> y = np.ma.fromflex(rec2)
>>> y
masked_array(data =
[[0 0]
[0 0]],
mask =
[[False False]
[False False]],
fill_value = 999999)
"""
return masked_array(fxarray['_data'], mask=fxarray['_mask'])
class _convert2ma:
"""
Convert functions from numpy to numpy.ma.
Parameters
----------
_methodname : string
Name of the method to transform.
"""
__doc__ = None
def __init__(self, funcname, params=None):
self._func = getattr(np, funcname)
self.__doc__ = self.getdoc()
self._extras = params or {}
def getdoc(self):
"Return the doc of the function (from the doc of the method)."
doc = getattr(self._func, '__doc__', None)
sig = get_object_signature(self._func)
if doc:
# Add the signature of the function at the beginning of the doc
if sig:
sig = "%s%s\n" % (self._func.__name__, sig)
doc = sig + doc
return doc
def __call__(self, *args, **params):
# Find the common parameters to the call and the definition
_extras = self._extras
common_params = set(params).intersection(_extras)
# Drop the common parameters from the call
for p in common_params:
_extras[p] = params.pop(p)
# Get the result
result = self._func.__call__(*args, **params).view(MaskedArray)
if "fill_value" in common_params:
result.fill_value = _extras.get("fill_value", None)
if "hardmask" in common_params:
result._hardmask = bool(_extras.get("hard_mask", False))
return result
arange = _convert2ma('arange', params=dict(fill_value=None, hardmask=False))
clip = np.clip
diff = np.diff
empty = _convert2ma('empty', params=dict(fill_value=None, hardmask=False))
empty_like = _convert2ma('empty_like')
frombuffer = _convert2ma('frombuffer')
fromfunction = _convert2ma('fromfunction')
identity = _convert2ma(
'identity', params=dict(fill_value=None, hardmask=False))
indices = np.indices
ones = _convert2ma('ones', params=dict(fill_value=None, hardmask=False))
ones_like = np.ones_like
squeeze = np.squeeze
zeros = _convert2ma('zeros', params=dict(fill_value=None, hardmask=False))
zeros_like = np.zeros_like
def append(a, b, axis=None):
"""Append values to the end of an array.
.. versionadded:: 1.9.0
Parameters
----------
a : array_like
Values are appended to a copy of this array.
b : array_like
These values are appended to a copy of `a`. It must be of the
correct shape (the same shape as `a`, excluding `axis`). If `axis`
is not specified, `b` can be any shape and will be flattened
before use.
axis : int, optional
The axis along which `v` are appended. If `axis` is not given,
both `a` and `b` are flattened before use.
Returns
-------
append : MaskedArray
A copy of `a` with `b` appended to `axis`. Note that `append`
does not occur in-place: a new array is allocated and filled. If
`axis` is None, the result is a flattened array.
See Also
--------
numpy.append : Equivalent function in the top-level NumPy module.
Examples
--------
>>> import numpy.ma as ma
>>> a = ma.masked_values([1, 2, 3], 2)
>>> b = ma.masked_values([[4, 5, 6], [7, 8, 9]], 7)
>>> print(ma.append(a, b))
[1 -- 3 4 5 6 -- 8 9]
"""
return concatenate([a, b], axis)
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