numpy.random.permutation

numpy.random.permutation(x)

Randomly permute a sequence, or return a permuted range.

Parameters :

x : int or array_like

If x is an integer, randomly permute np.arange(x). If x is an array, make a copy and shuffle the elements randomly.

Returns :

out : ndarray

Permuted sequence or array range.

Examples

>>> np.random.permutation(10)
array([1, 7, 4, 3, 0, 9, 2, 5, 8, 6])

>>> np.random.permutation([1, 4, 9, 12, 15])
array([15,  1,  9,  4, 12])