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Check if columns of matrix are comprised in another matrix?

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Andrew Poissant
Andrew Poissant 2018년 7월 26일
답변: Bob Thompson 2018년 7월 26일
I have a matrix, A, that is 2x25x7. I also have a matrix, B, that is 2x17. I want to check each column in B and see if it is identical to any column in A for each layer in A. How would I do that? I looked at the ismember function but it only has a 'rows' attribute, no 'col' attribute.

답변 (1개)

Bob Thompson
Bob Thompson 2018년 7월 26일
[C, IA, IB] = intersect(A,B,'rows');
This will check each row, and return the identical values in C, index in A, and index in B. In glancing at the documentation I did not see anything about columns (pretty much a literal glance), but you could transpose your data and then check rows.
I'm also not quite sure how this will treat a 3D matrix, so you might have to loop through each layer of A.

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