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## Copyright (C) 1996, 2000, 2002, 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} {[@var{zer}, @var{pol}, @var{k}, @var{tsam}, @var{inname}, @var{outname}] =} sys2zp (@var{sys})
## Extract zero/pole/leading coefficient information from a system data
## structure.
##
## See @command{zp} for parameter descriptions.
##
## @strong{Example}
## @example
## octave:1> sys=ss([1 -2; -1.1,-2.1],[0;1],[1 1]);
## octave:2> [zer,pol,k] = sys2zp(sys)
## zer = 3.0000
## pol =
## -2.6953
## 1.5953
## k = 1
## @end example
## @end deftypefn
## Author: John Ingram <ingraje@eng.auburn.edu>
## Created: July 15, 1996
function [zer, pol, k, tsam, inname, outname] = sys2zp (sys)
if (nargin != 1)
print_usage ();
elseif (! isstruct (sys))
error ("sysconnect: sys must be in system data structure form")
elseif (! is_siso (sys))
[n, nz, m, p] = sysdimensions (sys);
error ("system is not SISO: %d inputs, %d outputs", m, p);
endif
## update zero-pole form
sys = sysupdate (sys, "zp");
zer = sys.zer;
pol = sys.pol;
k = sys.k;
tsam = sysgettsam (sys);
inname = sysgetsignals (sys, "in");
outname = sysgetsignals (sys, "out");
endfunction
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