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parallel.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 sysp = parallel(Asys,Bsys)
# function sysp = parallel(Asys,Bsys)
# Forms the parallel connection of two systems.
#
# ____________________
# | ________ |
# u ----->|----> | Asys |--->|----> y1
# | | -------- |
# | | ________ |
# |--->|----> | Bsys |--->|----> y2
# | -------- |
# --------------------
# Ksys
# Written by David Clem August 15, 1994
# completely rewritten Oct 1996 a s hodel
# SYS_INTERNAL accesses members of system structure
if(nargin != 2)
usage("sysp = parallel(Asys,Bsys)");
endif
if(! is_struct(Asys) )
error("1st input argument is not a system data structure")
elseif (! is_struct(Bsys) )
error("2nd input argument is not a system data structure")
endif
[Ann,Anz,mA] = sysdimensions(Asys);
[Bnn,Bnz,mB] = sysdimensions(Bsys);
if(mA != mB)
error(["Asys has ",num2str(mA)," inputs, Bsys has ",num2str(mB)," inputs"]);
endif
# save signal names
Ain = sysgetsignals(Asys,"in");
# change signal names to avoid warning messages from sysgroup
Asys = syssetsignals(Asys,"in",sysdefioname(length(Ain),"Ain_u"));
Bsys = syssetsignals(Bsys,"in",sysdefioname(length(Ain),"Bin_u"));
sysp = sysgroup(Asys,Bsys);
sysD = ss2sys([],[],[],[eye(mA);eye(mA)]);
sysp = sysmult(sysp,sysD);
sysp = syssetsignals(sysp,"in",Ain);
endfunction