% -*- texinfo -*-
% @deftypefn {Function File} {} rank (@var{a}, @var{tol})
% Compute the rank of @var{a}, using the singular value decomposition.
% The rank is taken to be the number of singular values of @var{a} that
% are greater than the specified tolerance @var{tol}. If the second
% argument is omitted, it is taken to be
%
% @example
% tol = max (size (@var{a})) * sigma(1) * eps;
% @end example
%
% @noindent
% where @code{eps} is machine precision and @code{sigma(1)} is the largest
% singular value of @var{a}.
% @end deftypefn