Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / control-2.3.52 / @lti / dss.m

diff --git a/octave_packages/control-2.3.52/@lti/dss.m b/octave_packages/control-2.3.52/@lti/dss.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 -*-
+## Convert to descriptor state-space model.
+## Since it is impossible to call a function inside @NAME without any
+## argument of class NAME (except the constructor @NAME/NAME.m),
+## the "constructor" for dss models is located outside folder @ss.
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: September 2010
+## Version: 0.1
+
+function sys = dss (sys)
+
+  if (nargin != 1)
+    print_usage ();
+  endif
+
+  if (! isa (sys, "ss"))
+    sys = ss (sys);
+  endif
+
+  a = __sys_data__ (sys);
+
+  sys = __set__ (sys, "e", eye (size (a)));
+
+endfunction
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