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

You can use

   ix = any(x,2);

any check whether there is any element that is not a zero. The second argument stands for "per-row" computation.

If you want to get the numeric index, you can use find function:

   numIx = find(ix);

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Another method:

  ix = sum(abs(x),2)~=0;