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Vectorizing this Operation

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Stuart
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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回答（1 个）

Walter Roberson
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.)

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