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diff --git a/octave_packages/control-2.3.52/@lti/transpose.m b/octave_packages/control-2.3.52/@lti/transpose.m
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+## Copyright (C) 2010   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 -*-
+## Transpose of LTI objects.  Used by Octave for "sys.'".
+## Useful for dual problems, i.e. controllability and observability
+## or designing estimator gains with @command{lqr} and @command{place}.
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: February 2010
+## Version: 0.1
+
+function sys = transpose (sys)
+
+  if (nargin != 1)  # prevent sys = transpose (sys1, sys2, sys3, ...)
+    error ("lti: transpose: this is an unary operator");
+  endif
+
+  [p, m] = size (sys);
+
+  sys = __transpose__ (sys);
+
+  sys.inname = repmat ({""}, p, 1);
+  sys.outname = repmat ({""}, m, 1);
+
+endfunction
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