Mercurial > octave
view scripts/control/abcddim.m @ 1315:611d403c7f3d
[project @ 1995-06-25 19:56:32 by jwe]
author | jwe |
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date | Sun, 25 Jun 1995 19:56:32 +0000 |
parents | 3f257ab07921 |
children | 84bd88b8acee |
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# Copyright (C) 1993, 1994, 1995 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. function [n, m, p] = abcddim (a, b, c, d) # 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. # Written by A. S. Hodel (scotte@eng.auburn.edu) August 1993. if (nargin != 4) error ("abcddim: invalid number of arguments. need four.") 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