如何使2d numpy数组成为3d数组? [英] How to make a 2d numpy array a 3d array?

问题描述

我有一个形状为(x，y)的2d数组，我想将其转换为形状为(x，y，1)的3d数组.有没有一种很好的Pythonic方式可以做到这一点?

I have a 2d array with shape (x, y) which I want to convert to a 3d array with shape (x, y, 1). Is there a nice Pythonic way to do this?

推荐答案

除了其他答案，您还可以将切片与

In addition to the other answers, you can also use slicing with numpy.newaxis:

>>> from numpy import zeros, newaxis
>>> a = zeros((6, 8))
>>> a.shape
(6, 8)
>>> b = a[:, :, newaxis]
>>> b.shape
(6, 8, 1)

甚至是这样(可以使用任意数量的尺寸):

Or even this (which will work with an arbitrary number of dimensions):

>>> b = a[..., newaxis]
>>> b.shape
(6, 8, 1)

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