find missing element between two matrix

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NA
NA el 17 de Mzo. de 2020
Comentada: NA el 18 de Mzo. de 2020
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];
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]

Respuesta aceptada

Stephen23
Stephen23 el 17 de Mzo. de 2020
Editada: Stephen23 el 17 de Mzo. de 2020
>> 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
  3 comentarios
Stephen23
Stephen23 el 18 de Mzo. de 2020
You could sort the rows first, e.g
>> A = [1,2;3,6;3,5;1,4;4,6;2,7;1,6;6,5;2,3;6,7;3,4];
>> B = [2,1;1,6;2,3;4,3;6,4];
>> [~,X] = setdiff(sort(A,2),sort(B,2),'rows','stable');
>> R = A(X,:);
or for earlier versions:
>> [~,X] = setdiff(sort(A,2),sort(B,2),'rows');
>> X = sort(X);
>> R = A(X,:)
R =
3 6
3 5
1 4
2 7
6 5
6 7
NA
NA el 18 de Mzo. de 2020
thanks

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