--- /dev/null
+## Copyright (C) 2009 Lukas F. Reichlin
+##
+## This file is part of LTI Syncope.
+##
+## LTI Syncope 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 3 of the License, or
+## (at your option) any later version.
+##
+## LTI Syncope 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 LTI Syncope. If not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## Matrix left division of LTI objects. If necessary, object conversion
+## is done by sys_group in mtimes. Used by Octave for "sys1 \\ sys2".
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: October 2009
+## Version: 0.1
+
+function sys = mldivide (sys1, sys2)
+
+ if (nargin != 2) # prevent sys = mldivide (sys1, sys2, sys3, ...)
+ error ("lti: mldivide: this is a binary operator");
+ endif
+
+ sys1 = inv (sys1); # let octave decide which inv() it uses
+
+ [p1, m1] = size (sys1);
+ [p2, m2] = size (sys2);
+
+ if (m2 != p1)
+ error ("lti: mldivide: system dimensions incompatible: (%dx%d) \ (%dx%d)",
+ p1, m1, p2, m2);
+ endif
+
+ sys = sys1 * sys2;
+
+endfunction
+