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随机排列


元素的随机排列

排列指的是元素的排列方式。例如,[3, 2, 1] 是 [1, 2, 3] 的一个排列,反之亦然。

NumPy 随机数模块为此提供了两种方法:shuffle()permutation()


数组洗牌

洗牌意味着就地改变元素的排列方式。即在数组本身中。

示例

随机打乱以下数组的元素

from numpy import random
import numpy as np

arr = np.array([1, 2, 3, 4, 5])

random.shuffle(arr)

print(arr)
自己试试 »

shuffle() 方法会更改原始数组。


生成数组的排列

示例

生成以下数组元素的随机排列

from numpy import random
import numpy as np

arr = np.array([1, 2, 3, 4, 5])

print(random.permutation(arr))
自己试试 »

permutation() 方法返回一个重新排列的数组(并保持原始数组不变)。



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