How to compare an array with 2D matrix?

2016 10 21
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更新时间：2016 10 21
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If I have an array A= [1,2] and matrix B= [3,4;8,6;1,2], How can I say that array A is present in B?

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KSSV
KSSV 2016-10-21

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doc ismember

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Image Analyst
Image Analyst 2016-10-21

2 个投票

Try ismember() with the 'rows' option:
[~, matchingRows] = ismember(A, B, 'rows')

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Emmanuel
Emmanuel 2016-10-21
Thanks!! That was really helpul. Is there a way I could return the indices? Also, it doesn't work when I have same elements multiple time in my MAtrix B. A returns only the first match in B, whereas the other matches are not getting noticed.
Image Analyst
Image Analyst 2016-10-21
Emmanuel, try this:
A= [1,2]
B= [3,4;8,6;1,2; 4,5; 1,2]
[inA, inB] = ismember(B, A, 'rows')
matchingRows = find(inB)
Emmanuel
Emmanuel 2016-10-21
Yeah! That works. Thank you very much..

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