numpy.rot90()

Rotate an array by 90 degrees in the counter-clockwise direction.

The first two dimensions are rotated; therefore, the array must be at least 2-D.

Examples

>>> 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]])