MATLAB: ~ismember does not work on the matrix

arrayismember

A=[1 1 5 6;
   2 2 1 5;
   3 1 4 2;
   4 4 2 1;
   5 6 2 1;]
B=[1 1 1;  %remain


   1 4 2;
   1 5 6;
   2 1 5;
   4 2 1;
   4 2 2;  %remain
   6 2 1;
   6 3 1;] %remain
I would like the output, C to display
C=[1 1 1;
   4 2 2;
   6 3 1;]
I tried the following:
[idx1,idx2] = ismember(A(:,2:4),B,'rows');
However, when I used ~
[idx1,idx2] = ~ismember(A(:,2:4),B,'rows');
An error's returned.
May I know why is this so and any suggestions on how to get around this?

Best Answer

Try
C = setdiff(B,A(:,2:end),'rows')
or
C = B(~ismember(B,A(:,2:end),'rows'),:)
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