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is_siso.m
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1999-12-24
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## Copyright (C) 1996 Auburn University. All Rights Reserved
##
## This file is part of Octave.
##
## Octave 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 2, or (at your option) any
## later version.
##
## Octave 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 Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
## -*- texinfo -*-
## @deftypefn {Function File } { @var{retval} =} is_siso (@var{sys})
## return nonzero if the system data structure
## @var{sys} is single-input, single-output.
## @end deftypefn
function SISO = is_siso (sys)
## function SISO = is_siso(sys)
## return nonzero if the system sys is single-input, single-output.
## a s hodel July 1996, 1998
if(nargin != 1)
usage("SISO = is_siso(sys)");
elseif( !is_struct(sys))
error("input must be a system structure (see ss2sys, tf2sys, zp2sys)");
endif
[n,nz,m,p] = sysdimen(sys);
SISO = (m == 1 & p == 1);
endfunction