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Module « numpy.matlib »

Fonction squeeze - module numpy.matlib

Signature de la fonction squeeze

def squeeze(a, axis=None) 

Description

help(numpy.matlib.squeeze)

Remove axes of length one from `a`.

Parameters
----------
a : array_like
    Input data.
axis : None or int or tuple of ints, optional
    Selects a subset of the entries of length one in the
    shape. If an axis is selected with shape entry greater than
    one, an error is raised.

Returns
-------
squeezed : ndarray
    The input array, but with all or a subset of the
    dimensions of length 1 removed. This is always `a` itself
    or a view into `a`. Note that if all axes are squeezed,
    the result is a 0d array and not a scalar.

Raises
------
ValueError
    If `axis` is not None, and an axis being squeezed is not of length 1

See Also
--------
expand_dims : The inverse operation, adding entries of length one
reshape : Insert, remove, and combine dimensions, and resize existing ones

Examples
--------
>>> import numpy as np
>>> x = np.array([[[0], [1], [2]]])
>>> x.shape
(1, 3, 1)
>>> np.squeeze(x).shape
(3,)
>>> np.squeeze(x, axis=0).shape
(3, 1)
>>> np.squeeze(x, axis=1).shape
Traceback (most recent call last):
...
ValueError: cannot select an axis to squeeze out which has size
not equal to one
>>> np.squeeze(x, axis=2).shape
(1, 3)
>>> x = np.array([[1234]])
>>> x.shape
(1, 1)
>>> np.squeeze(x)
array(1234)  # 0d array
>>> np.squeeze(x).shape
()
>>> np.squeeze(x)[()]
1234

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