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Module « numpy.matlib »

Fonction place - module numpy.matlib

Signature de la fonction place

def place(arr, mask, vals) 

Description

help(numpy.matlib.place)

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

Similar to ``np.copyto(arr, vals, where=mask)``, the difference is that
`place` uses the first N elements of `vals`, where N is the number of
True values in `mask`, while `copyto` uses the elements where `mask`
is True.

Note that `extract` does the exact opposite of `place`.

Parameters
----------
arr : ndarray
    Array to put data into.
mask : array_like
    Boolean mask array. Must have the same size as `a`.
vals : 1-D sequence
    Values to put into `a`. Only the first N elements are used, where
    N is the number of True values in `mask`. If `vals` is smaller
    than N, it will be repeated, and if elements of `a` are to be masked,
    this sequence must be non-empty.

See Also
--------
copyto, put, take, extract

Examples
--------
>>> import numpy as np
>>> arr = np.arange(6).reshape(2, 3)
>>> np.place(arr, arr>2, [44, 55])
>>> arr
array([[ 0,  1,  2],
       [44, 55, 44]])

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