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diff --git a/octave_packages/control-2.3.52/@lti/mrdivide.m b/octave_packages/control-2.3.52/@lti/mrdivide.m
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+## 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 right 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 = mrdivide (sys1, sys2)
+
+  if (nargin != 2)    # prevent sys = mrdivide (sys1, sys2, sys3, ...)
+    error ("lti: mrdivide: this is a binary operator");
+  endif
+
+  sys2 = inv (sys2);  # let octave decide which inv() it uses
+
+  [p1, m1] = size (sys1);
+  [p2, m2] = size (sys2);
+
+  if (m2 != p1)
+    error ("lti: mrdivide: system dimensions incompatible: (%dx%d) / (%dx%d)",
+            p1, m1, p2, m2);
+  endif
+
+  sys = sys1 * sys2;
+
+endfunction
+