delete certain rows from a matrix
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I have two matrices and want to delete the rows of the first matrix which are identical to particular rows of the second matrix. For example, I have q = [1 0 0 0; 2 3 4 5; 6 7 8 9] and w = [1 0 0 0]. I want a generic command for q to become [2 3 4 5;6 7 8 9] , i.e., delete [1 0 0 0] from w
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Azzi Abdelmalek
2015-8-25
编辑：Azzi Abdelmalek
2015-8-25
q = [1 0 0 0; 2 3 4 5; 6 7 8 9]
w = [1 0 0 0]
q=setdiff(q,w,'rows')
or
q = [1 0 0 0; 2 3 4 5; 6 7 8 9]
w = [1 0 0 0]
q(ismember(q,w,'rows'))=[]
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setdiff(q,w,'rows','stable')
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If preserving repeated rows q(i,:) is important, then,
idx=all( bsxfun(@eq,q,w), 2);
result=q(~idx,:);
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