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## Copyright (C) 1996 John W. Eaton
##
## 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
## 02111-1307, USA.
## Usage: [n, m, p] = abcddim (a, b, c, d)
##
## Check for compatibility of the dimensions of the matrices defining
## the linear system (a, b, c, d).
##
## Returns n = number of system states,
## m = number of system inputs,
## p = number of system outputs.
##
## Returns n = m = p = -1 if the system is not compatible.
## Author: A. S. Hodel <scotte@eng.auburn.edu>
## Created: August 1993
## Adapted-By: jwe
function [n, m, p] = abcddim (a, b, c, d)
if (nargin != 4)
error ("usage: abcddim (a, b, c, d)");
endif
n = m = p = -1;
[an, am] = size(a);
if (an != am)
error ("abcddim: a is not square");
endif
[bn, bm] = size(b);
if (bn != am)
error ("abcddim: a and b are not compatible");
endif
[cn, cm] = size(c);
if (cm != an)
error ("abcddim: a and c are not compatible");
endif
[dn, dm] = size(d);
if (cn != dn)
error ("abcddim: c and d are not compatible");
endif
if (bm != dm)
error ("abcddim: b and d are not compatible");
endif
n = an;
m = bm;
p = cn;
endfunction
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.