Counting number of zeros in column or row, without looping

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Ulrik Nash 2011-7-8

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Hi Everyone,

If I have a matrix A, is there a way to create a 1,c vector containing the number of non-zeros in each columns, and simillarly, a r,1 vector containing the number of non-zeros in each row, all without looping?

Perhaps some use of nnz I am unaware of?

Regards,

Ulrik

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Nathan Greco 2011-7-8

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Given A:

   idx = A~=0;
   c = sum(idx,1);
   r = sum(idx,2);

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Ulrik Nash 2011-7-8

Thank you Nathan, much appreciated!

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MATLAB Mathematics Sparse Matrices

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