numpy.random.Generator.permutation

method

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

随机置换一个序列,或者返回一个置换后的范围.

参数:

xint 或 array_like

如果 x 是一个整数,则随机置换 np.arange(x) .如果 x 是一个数组,则复制一份并随机打乱元素.

axis整数,可选

x 沿其打乱的轴.默认为 0.

返回:

outndarray

置换后的序列或数组范围.

示例

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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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