X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fsignal-1.1.3%2Ftf2ss.m;fp=octave_packages%2Fsignal-1.1.3%2Ftf2ss.m;h=1c7aac1e3331078fe3265df032b80256d7a078df;hp=0000000000000000000000000000000000000000;hb=f5f7a74bd8a4900f0b797da6783be80e11a68d86;hpb=1705066eceaaea976f010f669ce8e972f3734b05

diff --git a/octave_packages/signal-1.1.3/tf2ss.m b/octave_packages/signal-1.1.3/tf2ss.m
new file mode 100644
index 0000000..1c7aac1
--- /dev/null
+++ b/octave_packages/signal-1.1.3/tf2ss.m
@@ -0,0 +1,63 @@
+## Copyright (C) 1994-1996, 1998, 2000, 2002, 2004, 2005, 2007 Auburn University
+## Copyright (C) 2012 Lukas F. Reichlin <lukas.reichlin@gmail.com>
+##
+## This program 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.
+##
+## This program 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
+## this program; if not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {[@var{a}, @var{b}, @var{c}, @var{d}] =} tf2ss (@var{num}, @var{den})
+## Conversion from transfer function to state-space.
+## The state space system:
+## @iftex
+## @tex
+## $$ \dot x = Ax + Bu $$
+## $$ y = Cx + Du $$
+## @end tex
+## @end iftex
+## @ifinfo
+## @example
+##       .
+##       x = Ax + Bu
+##       y = Cx + Du
+## @end example
+## @end ifinfo
+## is obtained from a transfer function:
+## @iftex
+## @tex
+## $$ G(s) = { { \rm num }(s) \over { \rm den }(s) } $$
+## @end tex
+## @end iftex
+## @ifinfo
+## @example
+##                 num(s)
+##           G(s)=-------
+##                 den(s)
+## @end example
+## @end ifinfo
+##
+## The state space system matrices obtained from this function 
+## will be in observable companion form as Wolovich's Observable
+## Structure Theorem is used.
+## @end deftypefn
+
+## Author: R. Bruce Tenison <btenison@eng.auburn.edu>
+
+function [a, b, c, d, e] = tf2ss (varargin)
+
+  if (nargin == 0)
+    print_usage ();
+  endif
+
+  [a, b, c, d, e] = dssdata (tf (varargin{:}), []);
+
+endfunction