numpy.rot90 — NumPy v2.2 Manual (original) (raw)
numpy.rot90(m, k=1, axes=(0, 1))[source]#
Rotate an array by 90 degrees in the plane specified by axes.
Rotation direction is from the first towards the second axis. This means for a 2D array with the default k and axes, the rotation will be counterclockwise.
Parameters:
marray_like
Array of two or more dimensions.
kinteger
Number of times the array is rotated by 90 degrees.
axes(2,) array_like
The array is rotated in the plane defined by the axes. Axes must be different.
Returns:
yndarray
A rotated view of m.
See also
Reverse the order of elements in an array along the given axis.
Flip an array horizontally.
Flip an array vertically.
Notes
rot90(m, k=1, axes=(1,0)) is the reverse ofrot90(m, k=1, axes=(0,1))
rot90(m, k=1, axes=(1,0)) is equivalent torot90(m, k=-1, axes=(0,1))
Examples
import numpy as np m = np.array([[1,2],[3,4]], int) m array([[1, 2], [3, 4]]) np.rot90(m) array([[2, 4], [1, 3]]) np.rot90(m, 2) array([[4, 3], [2, 1]]) m = np.arange(8).reshape((2,2,2)) np.rot90(m, 1, (1,2)) array([[[1, 3], [0, 2]], [[5, 7], [4, 6]]])