Function Reference
— Function File: rank (a, tol)

Compute the rank of a, using the singular value decomposition. The rank is taken to be the number of singular values of a that are greater than the specified tolerance tol. If the second argument is omitted, it is taken to be

          tol = max (size (a)) * sigma(1) * eps;

where eps is machine precision and sigma(1) is the largest singular value of a.