% -*- texinfo -*-
% @deftypefn {Function File} {[@var{r}, @var{k}] =} rref (@var{a}, @var{tol})
%
% Returns the reduced row echelon form of @var{a}. @var{tol} defaults
% to @code{eps * max (size (@var{a})) * norm (@var{a}, inf)}.
%
% Called with two return arguments, @var{k} returns the vector of
% 'bound variables', which are those columns on which elimination
% has been performed.
%
% @end deftypefn