Vectorizing this Operation

Question

Stuart 2011-8-20

关闭： MATLAB Answer Bot 2021-8-20

I have list of random permutations of length 3: [1 0 0], [0 1 0], [0 0 1], [1 1 0], ...

I have matrix of random values from 1 to 6 of size m by n. Where each value indexes a permutation.

I want to obtain the m by 3*n matrix where each index is replaced by its corresponding permutation. Advice?

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Answer 1

Walter Roberson 2011-8-20

It will look something like

reshape(perms(pidx(:),:).',size(pidx,2)*size(perms,2),[]).'

but I didn't bother testing it out to be sure it gets everything in the right place (it's my bedtime.)