Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
785 views
in Technique[技术] by (71.8m points)

python - Index multidimensional array with index array

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]]

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

Any hints?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

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

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

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...