numpy.rot90

numpy.rot90(m, k=1)

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.

Parameters :

m : array_like

Array of two or more dimensions.

k : integer

Number of times the array is rotated by 90 degrees.

Returns :

y : ndarray

Rotated array.

See also

fliplr

Flip an array horizontally.

flipud

Flip an array vertically.

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]])