具有索引数组的索引多维数组 [英] Index multidimensional array with index array

问题描述

我有一个索引元组数组，我想用它从多维numpy数组中选取值，

I have an array of index tuples and I would like to use it to pick out values from a multidimensional numpy array,

import numpy
a = numpy.random.rand(10, 10, 10)
idx = [[1, 1, 2], [0, 3, 7], [9, 8, 4], [9, 9, 9]]

理解[a[i, j, k] for i, j, k in idx]仅在已知a.ndim的情况下有效.

The comprehension [a[i, j, k] for i, j, k in idx] only worked if a.ndim was known.

有任何提示吗?

推荐答案

您可以将idx的转置版本转换为元组，然后为矢量化解决方案建立索引-

You could convert the transposed version of idx to a tuple and then index for a vectorized solution -

a[tuple(np.transpose(idx))]

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