使用NumPy反转数组的一部分 [英] Reverse part of an array using NumPy

问题描述

我正在尝试使用数组切片来反转 NumPy 数组的一部分.例如，如果我的数组是

I am trying to use array slicing to reverse part of a NumPy array. If my array is, for example,

a = np.array([1,2,3,4,5,6])

那我可以得到一个切片b

then I can get a slice b

b = a[::-1]

这是原始数组上的视图.我想要的是部分反转的视图，例如

Which is a view on the original array. What I would like is a view that is partially reversed, for example

1,4,3,2,5,6

如果您不完全了解NumPy的设计方式，那么我会遇到性能问题，因此，我希望尽可能避免花哨"的索引编制.

I have encountered performance problems with NumPy if you don't play along exactly with how it is designed, so I would like to avoid "fancy" indexing if it is possible.

推荐答案

如果您不喜欢一个指数的失败

If you don't like the off by one indices

>>> a = np.array([1,2,3,4,5,6])
>>> a[1:4] = a[1:4][::-1]
>>> a
array([1, 4, 3, 2, 5, 6])

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