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Module « numpy.matlib »

Fonction putmask - module numpy.matlib

Signature de la fonction putmask

Description

help(numpy.matlib.putmask)

putmask(a, mask, values)

Changes elements of an array based on conditional and input values.

Sets ``a.flat[n] = values[n]`` for each n where ``mask.flat[n]==True``.

If `values` is not the same size as `a` and `mask` then it will repeat.
This gives behavior different from ``a[mask] = values``.

Parameters
----------
a : ndarray
    Target array.
mask : array_like
    Boolean mask array. It has to be the same shape as `a`.
values : array_like
    Values to put into `a` where `mask` is True. If `values` is smaller
    than `a` it will be repeated.

See Also
--------
place, put, take, copyto

Examples
--------
>>> import numpy as np
>>> x = np.arange(6).reshape(2, 3)
>>> np.putmask(x, x>2, x**2)
>>> x
array([[ 0,  1,  2],
       [ 9, 16, 25]])

If `values` is smaller than `a` it is repeated:

>>> x = np.arange(5)
>>> np.putmask(x, x>1, [-33, -44])
>>> x
array([  0,   1, -33, -44, -33])

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