how to find the row index of specific vector in a matrix

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d d 2019-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/454859-how-to-find-the-row-index-of-specific-vector-in-a-matrix

评论： AKASH BHOYAR 2022-5-23

Hi everyone, suppose there's a marix [2 0;-2 1;2 3], I want find the row index of [-2 1], i.e., [-2 1] is on the second row of [2 0;-2 1;2 3]. how to realize it in matlab? Many thanks!

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Star Strider 2019-4-7

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Try this:

A = [2 0;-2 1;2 3];
RowIdx = find(ismember(A, [-2 1],'rows'))

producing:

RowIdx =
     2

How would I do this if the vector I am looking for is a subset of A? i.e. If A is a matrix with three columns, and I want to find which row a 1x2 array x is in of A? idx=find(ismember(A,x,'rows')) obviously wouldn't work here, but is there a way to do this still using the find(ismember()) command?