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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
-