Delete duplicated row in a matrix

2013 6 25

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I have two matrix like this:

    a=[1 2 3; 2 1 3; 2 2 4;2 3 6;2 4 5;3 7 7;3 6 6]
    b=[1 2 5;2 2 5;2 3 6;2 4 7;3 6 7]

I want delete, without change order, the duplicated rows without consider third column, but only respect column 1 and 2.

So the output would be: [2 1 3; 3 7 7]

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Tom 2013-6-25

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   I = ~ismember(a(:,1:2),b(:,1:2),'rows');
   a = a(I,:)

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