MATLAB: Counting number of zeros in column or row, without looping

Question

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

Answer 1

Given A:

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