Suppose I have the following matrix (the one I'm working on has 1000×1000 cells, so I'll simplify things):

a=[1,2,3; 8,7,8; 1,2,3; 5,6,0; 2,5,7; 2,5,7];

I want to get rid of rows that repeat themselves, so that I have one row left from each repetition set. The desired matrix in this case would be:

a=[1,2,3; 8,7,8; 5,6,0; 2,5,7];

How do I do this?

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