Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / control-2.3.52 / __dss2ss__.m

diff --git a/octave_packages/control-2.3.52/__dss2ss__.m b/octave_packages/control-2.3.52/__dss2ss__.m
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+## Copyright (C) 2011   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 descriptor state-space system into regular state-space form.
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: September 2011
+## Version: 0.1
+
+function [a, b, c, d, e] = __dss2ss__ (a, b, c, d, e)
+
+  if (isempty (e))
+    return;
+  elseif (rcond (e) < eps)  # check for singularity
+    error ("ss: dss2ss: descriptor matrice 'e' singular");
+  else
+    [a, b, c, d] = slsb10jd (a, b, c, d, e);
+    e = [];
+  endif
+
+endfunction
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