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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("sysconnect: sys must be in system data structure form")
- elseif (! is_siso(sys) )
- [n, nz, m, p] = sysdimensions(sys);
- error(["system is not SISO (",num2str(m)," inputs, ...
- ", num2str(p)," outputs"]);
- 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
-
-
-