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numpy.rot90()

numpy.rot90(m, k=1) [source]

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]])

Links:

https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.rot90.html

doc_NumPy

2017-01-10 18:18:33

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