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sys2zp.m
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1999-04-29
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# Copyright (C) 1996 A. Scottedward Hodel
#
# 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, 675 Mass Ave, Cambridge, MA 02139, USA.
function [zer,pol,k,tsam,inname,outname] = sys2zp(sys)
# [zer,pol,k,tsam,inname,outname] = sys2zp(sys)
# extract zero/pole/leading coefficient information from a system data
# structure
# inputs: sys: system data structure
# outputs:
# zer: vector of system zeros
# pol: vector of system poles
# k: scalar leading coefficient
# tsam: sampling period. default: 0 (continuous system)
# inname, outname: input/output signal names (strings)
# 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