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ss2zp.m
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1999-03-05
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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] = ss2zp(a,b,c,d)
# Converts a state space representation to a set of poles and zeros.
#
# [pol,zer,k] = ss2zp(a,b,c,d) returns the poles and zeros of the state space
# system (a,b,c,d). K is a gain associated with the zeros.
#
# used internally in system data structure manipulations
# Written by David Clem August 15, 1994
# Hodel: changed order of output arguments to zer, pol, k. July 1996
# a s hodel: added argument checking, allow for pure gain blocks aug 1996
if(nargin != 4)
usage("[zer,pol,k] = ss2zp(a,b,c,d)");
endif
[n,m,p] = abcddim(a,b,c,d);
if (n == -1)
error("ss2tf: Non compatible matrix arguments");
elseif ( (m != 1) | (p != 1))
error(["ss2tf: not SISO system: m=",num2str(m)," p=",num2str(p)]);
endif
if(n == 0)
# gain block only
k = d;
zer = pol = [];
else
# First, get the denominator coefficients
[zer,k] = tzero(a,b,c,d);
pol = eig(a);
endif
endfunction