numpy.random.Generator.permutation#

method

random.Generator.permutation(x,axis=0)#

Randomly permute a sequence, or return a permuted range.

Parameters:

xint or array_like

Ifx is an integer, randomly permutenp.arange(x).Ifx is an array, make a copy and shuffle the elementsrandomly.

axisint, optional

The axis whichx is shuffled along. Default is 0.

Returns:

outndarray

Permuted sequence or array range.

Examples

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

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

>>>arr=np.arange(9).reshape((3,3))>>>rng.permutation(arr)array([[6, 7, 8], # random       [0, 1, 2],       [3, 4, 5]])

>>>rng.permutation("abc")Traceback (most recent call last):...numpy.exceptions.AxisError:axis 0 is out of bounds for array of dimension 0

>>>arr=np.arange(9).reshape((3,3))>>>rng.permutation(arr,axis=1)array([[0, 2, 1], # random       [3, 5, 4],       [6, 8, 7]])

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