Add a useful package (from Source forge) for octave

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

diff --git a/octave_packages/control-2.3.52/@tf/__set__.m b/octave_packages/control-2.3.52/@tf/__set__.m
new file mode 100644 (file)
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+++ b/octave_packages/control-2.3.52/@tf/__set__.m
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+## Copyright (C) 2009, 2012   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 -*-
+## Set or modify properties of TF objects.
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: October 2009
+## Version: 0.2
+
+function sys = __set__ (sys, prop, val)
+
+  switch (prop)  # {<internal name>, <user name>}
+    case "num"
+      num = __vec2tfpoly__ (val);
+      __tf_dim__ (num, sys.den);
+      sys.num = num;
+
+    case "den"
+      den = __vec2tfpoly__ (val);
+      __tf_dim__ (sys.num, den);
+      sys.den = den;
+
+    case {"tfvar", "variable"}
+      if (ischar (val))
+        sys.tfvar = val;
+      else
+        error ("tf: set: invalid transfer function variable");
+      endif
+
+    case "inv"
+      if (! isdt (sys))
+        error ("tf: set: property 'inv' requires discrete-time system");
+      elseif (! isscalar (val))
+        error ("tf: set: property 'inv' must be a scalar logical");
+      else
+        sys.inv = logical (val);
+      endif
+
+    otherwise
+      error ("tf: set: invalid property name");
+
+  endswitch
+
+endfunction