How to find the indices of nonzero rows in a matrix?

Question

How to find the indices of nonzero rows in a matrix?

Example:

A = [
       14  0  6  9  8  17
       85 14  1  3  0  99
       0   0  0  0  0   0 
           


        

Answer 1

Here's one that ab(uses) the fast matrix multiplication in MATLAB -

idx = find(abs(A)*ones(size(A,2),1))