RANK  RANK Calculate the Rank of a Matrix


Usage
 
 Returns the rank of a matrix.  There are two ways to use
 the rank function is
 
    y = rank(A,tol)
 
 where tol is the tolerance to use when computing the
 rank.  The second form is
 
    y = rank(A)
 
 in which case the tolerance tol is chosen as
 
    tol = max(size(A))*max(s)*eps,
 
 where s is the vector of singular values of A.  The
 rank is computed using the singular value decomposition svd.
 