function boo = isproper(sys)
%ISPROPER  True for proper LTI systems.
%
%   ISPROPER(SYS) returns 1 (true) if the LTI model SYS is proper 
%   (relative degree<=0), and 0 (false) otherwise.  If SYS is an
%   array of LTI models, ISPROPER(SYS) is true if all models are
%   proper.
%
%   See also ISSISO, ISEMPTY, LTIMODELS.

%   Author(s): S. Almy
%   Copyright (c) 1986-98 by The MathWorks, Inc.
%   $Revision: 1.2 $  $Date: 1998/05/22 19:21:19 $

boo = 1;