Indexing (extracting value from rows)

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dan berkowitz
dan berkowitz on 5 Jun 2019
Commented: dan berkowitz on 8 Jun 2019
Hi,
I have a 5 x 5 array, A, and a 5 x 1 array, B = [2 3 1 4 3]'. How can I extract the element from each row of A as they occur in B. i.e., I want the 2nd value of row one of A, they 3rd value of row two of A, ..., and the 3rd value of row five of A.
Any help would be appreciated.
db

Accepted Answer

Matt J
Matt J on 5 Jun 2019
idx=sub2ind(size(A), ones(size(B)), B);
A(idx)

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