How to convert row and column vectors of a symmetric matrix to zero if diagonal value is zero?
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I have symmetric matrices of large size. I need to ensure that if there are any zeros on the main diagonal, then their corresponding row and column vectors are also set to zero. Please help.
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Krishna Kumar
2011-6-23
1 个投票
This would do it without loop- index=find(diag(your_matrix)==0); your_matrix(index,:)=0; your_matrix(:,index)=0;
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Andrei Bobrov
2011-6-23
dg = diag(your_matrix);
your_matrix(dg*dg'==0)=0
dg = diag(your_matrix);
l1 = dg == 0;
your_matrix(diag(l1)==1) = rand(nnz(l1),1)
2 个评论
Muhammad Shafique
2011-6-23
Matt Fig
2011-6-23
I like your first approach, Andrei. This is along the same line, and faster for larger arrays.
B1 = logical(diag(A));
B1 = bsxfun(@times,bsxfun(@times,A,B1),B1.');
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