numpy.ma.make_mask()

numpy.ma.make_mask(m, copy=False, shrink=True, dtype=) [source]

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:

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`.

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')])

Links:

https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.ma.make_mask.html

doc_NumPy

2025-01-10 15:47:30

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