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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] = sysdimensions(sys);
-
- SISO = (m == 1 & p == 1);
-
- endfunction
-