Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / control-2.3.52 / @lti / ssdata.m

diff --git a/octave_packages/control-2.3.52/@lti/ssdata.m b/octave_packages/control-2.3.52/@lti/ssdata.m
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+## Copyright (C) 2009, 2010, 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 -*-
+## @deftypefn {Function File} {[@var{a}, @var{b}, @var{c}, @var{d}, @var{tsam}] =} ssdata (@var{sys})
+## Access state-space model data.
+## Argument @var{sys} is not limited to state-space models.
+## If @var{sys} is not a state-space model, it is converted automatically.
+##
+## @strong{Inputs}
+## @table @var
+## @item sys
+## Any type of LTI model.
+## @end table
+##
+## @strong{Outputs}
+## @table @var
+## @item a
+## State transition matrix (n-by-n).
+## @item b
+## Input matrix (n-by-m).
+## @item c
+## Measurement matrix (p-by-n).
+## @item d
+## Feedthrough matrix (p-by-m).
+## @item tsam
+## Sampling time in seconds.  If @var{sys} is a continuous-time model,
+## a zero is returned.
+## @end table
+## @end deftypefn
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: September 2009
+## Version: 0.4
+
+function [a, b, c, d, tsam, scaled] = ssdata (sys)
+
+  if (! isa (sys, "ss"))
+    sys = ss (sys);
+  endif
+
+  [a, b, c, d, e, ~, scaled] = __sys_data__ (sys);
+
+  [a, b, c, d, e] = __dss2ss__ (a, b, c, d, e);
+
+  tsam = sys.tsam;
+
+endfunction
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