NumPy: squeeze() function
numpy.squeeze() function
The squeeze() function is used to remove single-dimensional entries from the shape of an array.
Syntax:
numpy.squeeze(a, axis=None)
Version: 1.15.0
Parameter:
Name | Description | Required / Optional |
---|---|---|
a | Input data. | Required |
axis | Selects a subset of the single-dimensional entries in the shape. If an axis is selected with shape entry greater than one, an error is raised. | Optional |
Return value:
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.
Raises: ValueError - If axis is not None, and an axis being squeezed is not of length 1
Example-1: numpy.squeeze() function
>>> import numpy as np
>>> a = np.array([[[0], [2], [4]]])
>>> a.shape
(1, 3, 1)
>>> np.squeeze(a).shape
(3,)
Pictorial Presentation:
Example-2: numpy.squeeze() function
>>> import numpy as np
>>> a = np.array([[[0], [2], [4]]])
>>> np.squeeze(a, axis=0).shape
(3, 1)
>>> np.squeeze(a, axis=1).shape
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.6/dist-packages/numpy/core/fromnumeric.py", line 1201, in squeeze
return squeeze(axis=axis)
ValueError: cannot select an axis to squeeze out which has size not equal to one
>>> np.squeeze(a, axis=2).shape
(1, 3)
Python - NumPy Code Editor:
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