How to convert row and column vectors of a symmetric matrix to zero if diagonal value is zero?

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.

Answer 1

[Krishna Kumar]

This would do it without loop- index=find(diag(your_matrix)==0); your_matrix(index,:)=0; your_matrix(:,index)=0;

[Muhammad Shafique]

Thanks a lot Krishna. How can we change the zeros on the diagonal to a certain value, instead?

Answer 2

[Andrei Bobrov]

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)

[Muhammad Shafique]

Thanks Andrei.

[Matt Fig]

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.');