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Comparing two arrays of different length

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Majbah
Majbah on 17 Nov 2014
Commented: Josep Llobet on 5 Oct 2021 at 8:47
Hi,
I have two arrays like, A=[11 11 2 3; 5 2 6 9] and B=[11 3; 2 9]. I want to know the indices of array A where the column of B is equal to column of A. In this case, the indices are [2 4].
How can I do that?
Thanks in Advance.

Accepted Answer

Giorgos Papakonstantinou
Giorgos Papakonstantinou on 17 Nov 2014
You could this to find it:
idx = ismember(A', B', 'rows');
c = 1:size(A, 2);
d = c(idx); % is your answer
  2 Comments
Josep Llobet
Josep Llobet on 5 Oct 2021 at 8:47
indeed, maybe
ismember(0, unique(idx))
used with 0 (no-coincident) or 1 (coincident), may be useful.
Then combined with
length(unique(idx))
For to know about the totallity of coincidences

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More Answers (1)

Azzi Abdelmalek
Azzi Abdelmalek on 17 Nov 2014
A=[11 11 2 3; 5 2 6 9]
B=[11 3; 2 9]
idx=find(ismember(A',B','rows'))

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