Mercurial > octave-nkf
view scripts/control/system/sys2tf.m @ 7016:93c65f2a5668
[project @ 2007-10-12 06:40:56 by jwe]
author | jwe |
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date | Fri, 12 Oct 2007 06:41:26 +0000 |
parents | 34f96dd5441b |
children | a1dbe9d80eee |
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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 3 of the License, 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, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {[@var{num}, @var{den}, @var{tsam}, @var{inname}, @var{outname}] =} sys2tf (@var{sys}) ## Extract transfer function data from a system data structure. ## ## See @command{tf} for parameter descriptions. ## ## @strong{Example} ## @example ## octave:1> sys=ss([1 -2; -1.1,-2.1],[0;1],[1 1]); ## octave:2> [num,den] = sys2tf(sys) ## num = 1.0000 -3.0000 ## den = 1.0000 1.1000 -4.3000 ## @end example ## @end deftypefn ## Author: R. Bruce Tenison <btenison@eng.auburn.edu> ## Created: June 24, 1994 ## modified to make sys2tf by A. S. Hodel Aug 1995 ## modified again for updated system format by John Ingram July 1996 function [num, den, tsam, inname, outname] = sys2tf (Asys) if(nargin != 1) print_usage (); endif if( !isstruct(Asys)) error("Asys must be a system data structure (see ss, tf, zp)"); elseif (! is_siso(Asys) ) [n, nz, m, p] = sysdimensions(Asys); error(["system is not SISO (",num2str(m)," inputs, ... ", num2str(p)," outputs"]); endif Asys = sysupdate(Asys,"tf"); # just in case num = Asys.num; den = Asys.den; tsam = sysgettsam(Asys); inname = sysgetsignals(Asys,"in"); outname = sysgetsignals(Asys,"out"); endfunction