find missing element between two matrix

Khloe - 2020-12-03T10:23:05+00:00

Question: find missing element between two matrix

I have    A=[1 2; 3 6; 3 5; 1 4; 4 6; 2 7; 1 6; 6 5; 2 3; 6 7; 3 4]; B=[1 2; 1 6; 2 3; 3 4; 4 6];,/pre? I want to find missing element between A and B result should be res=[3 6; 3 5; 1 4; 2 7; 6 5; 6 7] I used this res = A(~all(ismember(A,B),2),:); But it does not give me [3 6; 1 4]

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Expert Answer

Prashant Kumar answered . 2025-11-20

>> A = [1,2;3,6;3,5;1,4;4,6;2,7;1,6;6,5;2,3;6,7;3,4];
>> B = [1,2;1,6;2,3;3,4;4,6];
>> R = setdiff(A,B,'rows')
R =
   1   4
   2   7
   3   5
   3   6
   6   5
   6   7

To get the same order, use the 'stable' option or this:

 

>> [~,X] = setdiff(A,B,'rows');
>> X = sort(X);
>> R = A(X,:)
R =
   3   6
   3   5
   1   4
   2   7
   6   5
   6   7

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