numpy.rollaxis() function with example in python

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numpy.rollaxis(): This function roll the specified axis backwards, until it lies in a given position.

Syntax: numpy.rollaxis(a, axis, start=0)

This function continues to be supported for backward compatibility, but you should prefer moveaxis. The moveaxis function was added in NumPy 1.11.

a : ndarray
Input array.

axis : int
The axis to roll backwards. The positions of the other axes do not change relative to one another.

start : int, optional
The axis is rolled until it lies before this position. The default, 0, results in a “complete” roll.

res : ndarray
For NumPy >= 1.10.0 a view of a is always returned. For earlier NumPy versions a view of a is returned only if the order of the axes is changed, otherwise the input array is returned.

import numpy as np a = np.zeros((3,4,5,6)) b = np.rollaxis(a, 3, 1).shape print(b)


(3, 6, 4, 5)


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