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sys2zp.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{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 @ref{zp2sys} for parameter descriptions.
##
## @strong{Example}
## @example
## octave:1> sys=ss2sys([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
function [zer, pol, k, tsam, inname, outname] = sys2zp (sys)
## Created by John Ingram July 15 1996
if(nargin != 1)
usage("[zer,pol,k,tsam,inname,outname] = sys2zp(sys)");
elseif( !is_struct(sys))
error("syscnct: sys must be in system data structure form")
elseif (! is_siso(sys) )
[n, nz, m, p] = sysdimen(sys);
error(["system is not SISO (",num2str(m)," inputs, ...
", num2str(p)," outputs"]);
endif
## update zero-pole form
sys = sysupdat(sys,"zp");
zer = sys.zer;
pol = sys.pol;
k = sys.k;
tsam = sysgetts(sys);
inname = sysgetsg(sys,"in");
outname = sysgetsg(sys,"out");
endfunction