Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / control-2.3.52 / @ss / __sys2frd__.m

diff --git a/octave_packages/control-2.3.52/@ss/__sys2frd__.m b/octave_packages/control-2.3.52/@ss/__sys2frd__.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 -*-
+## SS to FRD conversion.
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: October 2010
+## Version: 0.1
+
+function [retsys, retlti] = __sys2frd__ (sys, w = [])
+
+  if (isempty (w))      # case sys = frd (sys)
+    w = __frequency_vector__ (sys);
+  endif
+
+  H = __freqresp__ (sys, w);
+
+  retsys = frd (H, w);  # tsam is set below
+  retlti = sys.lti;     # preserve lti properties
+
+endfunction
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