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## Copyright (C) 1996, 2000, 2002, 2003, 2004, 2005, 2006, 2007
## Auburn University. All rights reserved.
##
##
## This program is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} is_siso (@var{sys})
## Returns nonzero if the system data structure
## @var{sys} is single-input, single-output.
## @end deftypefn
## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu>
## Created: July 1996, 1998
function SISO = is_siso (sys)
if (nargin != 1)
print_usage ();
elseif (! isstruct (sys))
error ("input must be a system structure (see ss, tf, zp)");
endif
[n, nz, m, p] = sysdimensions (sys);
SISO = (m == 1 && p == 1);
endfunction
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