NumPy: rot90() function

Last update on May 28 2022 11:20:26 (UTC/GMT +8 hours)

numpy.rot90() function

The rot90() function is used to rotate an array by 90 degrees in the plane specified by axes.
Rotation direction is from the first towards the second axis.

Syntax:

numpy.rot90(m, k=1, axes=(0, 1))

Version: 1.15.0

Parameter:

Name	Description	Required / Optional
m	Array of two or more dimensions.	Required
k	Number of times the array is rotated by 90 degrees.	Required
axes	The array is rotated in the plane defined by the axes. Axes must be different.	Required

Return value:

y : ndarray - A rotated view of m.

Example-1: numpy.rot90() function

>>> import numpy as np
>>> m = np.array([[1,2], [3,4], [5,6]], int)
>>> m
array([[1, 2],
       [3, 4],
       [5, 6]])	   
>>> np.rot90(m)
array([[2, 4, 6],
       [1, 3, 5]])

Pictorial Presentation:

Example-2: numpy.rot90() function

>>> import numpy as np
>>> m = np.array([[1,2], [3,4], [5,6]], int)
>>> np.rot90(m, 3)
array([[5, 3, 1],
       [6, 4, 2]])

Pictorial Presentation:

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