如何在Matlab矩阵的每一列中选择一个元素? [英] How to select one element from each column of a matrix in matlab?

问题描述

a = [1 1 1; 2 2 2; 3 3 3];

b = [1 2 3];

如何调用一个函数来获取向量v[i] = a[b[i],i]?

How can I call one function to get a vector v[i] = a[b[i],i]?

推荐答案

v = a(sub2ind(size(a), b, 1:length(b)))

sub2ind将下标转​​换为单个索引.

sub2ind transforms subscripts into a single index.

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