function check_if_same (p1,p2)
%CHECK_IF_SAME check if two inputs are identical or not
%
% Example:
%   check_if_same (1:5, 2:6)
% See also: testall

%   Copyright 2006, Timothy A. Davis.
%   http://www.cise.ufl.edu/research/sparse

    if (isempty (p1))
	if (~isempty (p2))
	    p1		%#ok
	    p2		%#ok
	    error ('empty!') ;
	end
    elseif (any (p1 ~= p2))
	p1		%#ok
	p2		%#ok
	error ('!') ;
    end