从两个numpy数组中随机选择元素 [英] Choose elements from two numpy arrays at random

问题描述

我试图通过从每个元素中随机选择元素来将两个numpy数组合并在一起. 假设我有两个长度分别为x和y的数组，如下所示:

I am trying to merge two numpy arrays together by choosing elements from each at random. Say I have two arrays of equal length x and y as follows:

x = np.arange(10)
y = np.arange(10, 20)

和遮罩r:

r = np.random.choice([True, False], 10)

那么有什么方法可以从r是True的x和r是False的y中选择元素?

Then is there any way to select elements from x where r is True and from y where r is False?

我不必使用遮罩方法，但是我需要一些快速的东西，因为x和y实际上要比10长得多，因此理想情况下不涉及循环.

I don't have to use the mask approach, but I need something fast as x and y will be much longer than 10 in reality so ideally no looping involved.

推荐答案

如何?

z = y.copy()
z[r] = x[r]

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