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"""
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
"""
import builtins
import functools
import inspect
import operator
import re
import textwrap
import warnings
import numpy as np
import numpy._core.numerictypes as ntypes
import numpy._core.umath as umath
from numpy import (
_NoValue,
amax,
amin,
angle,
bool_,
expand_dims,
finfo, # noqa: F401
iinfo, # noqa: F401
iscomplexobj,
ndarray,
)
from numpy import array as narray # noqa: F401
from numpy._core import multiarray as mu
from numpy._core.numeric import normalize_axis_tuple
from numpy._utils import set_module
from numpy._utils._inspect import formatargspec, getargspec
__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', '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', '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', 'ones_like', 'outer', 'outerproduct', 'power', 'prod',
'product', 'ptp', 'put', 'putmask', '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', 'zeros_like',
]
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 compatibility.
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
notesplit = re.split(r'\n\s*?Notes\n\s*?-----', inspect.cleandoc(initialdoc))
notedoc = f"\n\nNotes\n-----\n{inspect.cleandoc(note)}\n"
return ''.join(notesplit[:1] + [notedoc] + notesplit[1:])
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': b'???',
'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)
float_types_list = [np.half, np.single, np.double, np.longdouble,
np.csingle, np.cdouble, np.clongdouble]
_minvals: dict[type, int] = {}
_maxvals: dict[type, int] = {}
for sctype in ntypes.sctypeDict.values():
scalar_dtype = np.dtype(sctype)
if scalar_dtype.kind in "Mm":
info = np.iinfo(np.int64)
min_val, max_val = info.min + 1, info.max
elif np.issubdtype(scalar_dtype, np.integer):
info = np.iinfo(sctype)
min_val, max_val = info.min, info.max
elif np.issubdtype(scalar_dtype, np.floating):
info = np.finfo(sctype)
min_val, max_val = info.min, info.max
elif scalar_dtype.kind == "b":
min_val, max_val = 0, 1
else:
min_val, max_val = None, None
_minvals[sctype] = min_val
_maxvals[sctype] = max_val
max_filler = _minvals
max_filler.update([(k, -np.inf) for k in float_types_list[:4]])
max_filler.update([(k, complex(-np.inf, -np.inf)) for k in float_types_list[-3:]])
min_filler = _maxvals
min_filler.update([(k, +np.inf) for k in float_types_list[:4]])
min_filler.update([(k, complex(+np.inf, +np.inf)) for k in float_types_list[-3:]])
del float_types_list
def _recursive_fill_value(dtype, f):
"""
Recursively produce a fill value for `dtype`, calling f on scalar dtypes
"""
if dtype.names is not None:
# We wrap into `array` here, which ensures we use NumPy cast rules
# for integer casts, this allows the use of 99999 as a fill value
# for int8.
# TODO: This is probably a mess, but should best preserve behavior?
vals = tuple(
np.array(_recursive_fill_value(dtype[name], f))
for name in dtype.names)
return np.array(vals, dtype=dtype)[()] # decay to void scalar from 0d
elif dtype.subdtype:
subtype, shape = dtype.subdtype
subval = _recursive_fill_value(subtype, f)
return np.full(shape, subval)
else:
return f(dtype)
def _get_dtype_of(obj):
""" Convert the argument for *_fill_value into a dtype """
if isinstance(obj, np.dtype):
return obj
elif hasattr(obj, 'dtype'):
return obj.dtype
else:
return np.asanyarray(obj).dtype
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'
======== ========
For structured types, a structured scalar is returned, with each field the
default fill value for its type.
For subarray types, the fill value is an array of the same size containing
the default scalar fill value.
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
--------
>>> import numpy as np
>>> 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)
"""
def _scalar_fill_value(dtype):
if dtype.kind in 'Mm':
return default_filler.get(dtype.str[1:], '?')
else:
return default_filler.get(dtype.kind, '?')
dtype = _get_dtype_of(obj)
return _recursive_fill_value(dtype, _scalar_fill_value)
def _extremum_fill_value(obj, extremum, extremum_name):
def _scalar_fill_value(dtype):
try:
return extremum[dtype.type]
except KeyError as e:
raise TypeError(
f"Unsuitable type {dtype} for calculating {extremum_name}."
) from None
dtype = _get_dtype_of(obj)
return _recursive_fill_value(dtype, _scalar_fill_value)
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, dtype or scalar
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 as np
>>> 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
"""
return _extremum_fill_value(obj, min_filler, "minimum")
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 or scalar
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 as np
>>> 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
"""
return _extremum_fill_value(obj, max_filler, "maximum")
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 is not None:
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 fill_value is not None, its value is forced to the given dtype.
The result is always a 0d array.
"""
ndtype = np.dtype(ndtype)
if fill_value is None:
fill_value = default_fill_value(ndtype)
# TODO: It seems better to always store a valid fill_value, the oddity
# about is that `_fill_value = None` would behave even more
# different then.
# (e.g. this allows arr_uint8.astype(int64) to have the default
# fill value again...)
# The one thing that changed in 2.0/2.1 around cast safety is that the
# default `int(99...)` is not a same-kind cast anymore, so if we
# have a uint, use the default uint.
if ndtype.kind == "u":
fill_value = np.uint(fill_value)
elif ndtype.names is not None:
if isinstance(fill_value, (ndarray, np.void)):
try:
fill_value = np.asarray(fill_value, dtype=ndtype)
except ValueError as e:
err_msg = "Unable to transform %s to dtype %s"
raise ValueError(err_msg % (fill_value, ndtype)) from e
else:
fill_value = np.asarray(fill_value, dtype=object)
fill_value = np.array(_recursive_set_fill_value(fill_value, ndtype),
dtype=ndtype)
elif isinstance(fill_value, str) and (ndtype.char not in 'OSVU'):
# Note this check doesn't work if fill_value is not a scalar
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.
# Also in case of converting string arrays.
try:
fill_value = np.asarray(fill_value, dtype=ndtype)
except (OverflowError, ValueError) as e:
# Raise TypeError instead of OverflowError or ValueError.
# OverflowError is seldom used, and the real problem here is
# that the passed fill_value is not compatible with the ndtype.
err_msg = "Cannot convert fill_value %s to dtype %s"
raise TypeError(err_msg % (fill_value, ndtype)) from e
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 as np
>>> 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 = list(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)
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
--------
>>> import numpy as np
>>> 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 `~numpy.ndarray`, with masked values replaced by
`fill_value`.
If `a` is not a `MaskedArray`, `a` itself is returned.
If `a` is a `MaskedArray` with no masked values, then ``a.data`` 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 : array_like, optional.
Can be scalar or non-scalar. If non-scalar, the
resulting filled array should be broadcastable
over input array. Default is None.
Returns
-------
a : ndarray
The filled array.
See Also
--------
compressed
Examples
--------
>>> import numpy as np
>>> import numpy.ma as ma
>>> x = 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]])
>>> x.filled(fill_value=333)
array([[333, 1, 2],
[333, 4, 5],
[ 6, 7, 8]])
>>> x.filled(fill_value=np.arange(3))
array([[0, 1, 2],
[0, 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 as np
>>> 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=2)
>>> 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=None, 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
--------
>>> import numpy as np
>>> 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.e+00, -1.e+00, 1.e+20, 1.e+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
def is_string_or_list_of_strings(val):
return (isinstance(val, str) or
(isinstance(val, list) and val and
builtins.all(isinstance(s, str) for s in val)))
###############################################################################
# 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(all='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 _MaskedUFunc:
def __init__(self, ufunc):
self.f = ufunc
self.__doc__ = ufunc.__doc__
self.__name__ = ufunc.__name__
self.__qualname__ = ufunc.__qualname__
def __str__(self):
return f"Masked version of {self.f}"
class _MaskedUnaryOperation(_MaskedUFunc):
"""
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):
super().__init__(mufunc)
self.fill = fill
self.domain = domain
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)