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sysupdat.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 sys = sysupdat(sys,opt)
# function retsys = sysupdat(sys,opt)
# Update the internal representation of a system.
# inputs:
# sys: system data structure
# opt: string: "tf" -> update transfer function
# "zp" -> update zero-pole form
# "ss" -> update state space form
# "all" -> all of the above
# outputs: retsys: contains union of data in sys and requested data.
# if requested data in sys is already up to date then retsys=sys.
#
# conversion to tf or zp exits with an error if the system is
# mixed continuous/digital
#
# see also: tf2sys, ss2sys, zp2sys, sysout, sys2ss, sys2tf, sys2zp
# Written by John Ingram 7-9-96
# check for correct number of inputs
if (nargin != 2)
usage("newsys = sysupdat(sys,opt)");
elseif(! is_struct(sys) )
error("1st argument must be system data structure")
elseif(! (strcmp(opt,"tf") + strcmp(opt,"zp") + ...
strcmp(opt,"ss") + strcmp(opt,"all")) )
error("2nd argument must be \"tf\", \"zp\", \"ss\", or \"all\"");
endif
# check to make sure not trying to make a SISO system out of a MIMO sys
if ( (strcmp(opt,"tf") + strcmp(opt,"zp") + strcmp(opt,"all")) ...
& strcmp(sysgetty(sys),"ss") & (! is_siso(sys) ) )
error("MIMO -> SISO update requested");
endif
# update transfer function if desired
if ( (strcmp(opt, "tf") + strcmp(opt,"all"))&& (!sys.sys(2)))
# check to make sure the system is not discrete and continuous
is_digit(sys);
# if original system zero-pole
if strcmp(sysgetty(sys),"zp")
[sys.num,sys.den] = zp2tf(sys.zer,sys.pol,sys.k);
sys.sys(2) = 1;
# if original system is state-space
elseif(sys.sys(1) == 2)
[sys.num,sys.den] = ss2tf(sys.a,sys.b,sys.c,sys.d);
sys.sys(2) = 1;
endif
endif
# update zero-pole if desired
if ( (strcmp(opt, "zp") + strcmp(opt,"all")) && (! sys.sys(3)) )
# check to make sure the system is not discrete and continuous
is_digit(sys);
# original system is transfer function
if (sys.sys(1) == 0)
[sys.zer,sys.pol,sys.k] = tf2zp(sys.num,sys.den);
sys.sys(3) = 1;
# original system is state-space
elseif(sys.sys(1) == 2)
[sys.zer,sys.pol,sys.k] = ss2zp(sys.a,sys.b,sys.c,sys.d);
sys.sys(3) = 1;
endif
endif
# update state-space if desired
if ( (strcmp(opt, "ss") + strcmp(opt,"all")) && (! sys.sys(4)) )
# original system is transfer function
if (sys.sys(1) == 0)
[sys.a,sys.b,sys.c,sys.d] = tf2ss(sys.num,sys.den);
sys.sys(4) = 1;
# original system is zero-pole
elseif(sys.sys(1) == 1)
[sys.a,sys.b,sys.c,sys.d] = zp2ss(sys.zer,sys.pol,sys.k);
sys.sys(4) = 1;
endif
# create new state names
sys.stname = sysdefst(sys.n, sys.nz);
endif
endfunction