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packsys.m
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1999-12-24
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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 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, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
## O B S O L E T E: use ss2sys instead.
## function Asys = packsys(a,b,c[,d,dflg])
##
## dflg: 0 for continuous time system, 1 for discrete-time system.
##
## defaults:
## D: 0 matrix of appropriate dimension.
## dflg: 0 (continuous time)
##
## Note: discrete-state sampling time is not included!
function Asys = packsys (a, b, c, d, dflg)
## Written by R. Bruce Tenison July 29, 1994
## Modified by David Clem November 13, 1994
## Modified by A. S. Hodel April 1995
warning("packsys is obsolete! Use ss2sys instead.");
if (nargin < 3 || nargin > 5)
disp("packsys: Invalid number of arguments")
endif
## check dflg
if(nargin == 5)
if( !is_scal(dflg))
[m,n] = size(dflg);
error(["packsys: dflg (",num2str(m),",",num2str(n), ...
") must be a scalar."]);
elseif( (dflg != 0) && (dflg != 1))
error(["packsys: dflg=",num2str(dflg),"must be 0 or 1"]);
endif
else
## default condition
dflg = 0;
endif
if (nargin == 3)
## No D matrix. Form a zero one!
[brows,bcols] = size(b);
[crows,ccols] = size(c);
d = zeros(crows,bcols);
endif
[n,m,p] = abcddim(a,b,c,d);
if (n == -1 || m == -1 || p == -1)
error("packsys: incompatible dimensions")
endif
Asys = ss2sys(a,b,c,d,dflg);
endfunction