Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / control-2.3.52 / @tf / __c2d__.m

diff --git a/octave_packages/control-2.3.52/@tf/__c2d__.m b/octave_packages/control-2.3.52/@tf/__c2d__.m
new file mode 100644 (file)
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+++ b/octave_packages/control-2.3.52/@tf/__c2d__.m
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+## Copyright (C) 2009, 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 the continuous TF model into its discrete-time equivalent.
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: October 2009
+## Version: 0.2
+
+function sys = __c2d__ (sys, tsam, method = "zoh", w0 = 0)
+
+  [p, m] = size (sys);
+
+  for i = 1 : p
+    for j = 1 : m
+      idx = substruct ("()", {i, j});
+      tmp = subsref (sys, idx);
+      tmp = c2d (ss (tmp), tsam, method, w0);
+      [num, den] = tfdata (tmp, "tfpoly");
+      sys.num(i, j) = num;
+      sys.den(i, j) = den;
+    endfor
+  endfor
+
+  sys.tfvar = "z";
+
+endfunction