[Octave-cvsupdate] SF.net SVN: octave:[10710] trunk/octave-forge/extra/control-devel

[<par...@us...>]

Revision: 10710
          http://octave.svn.sourceforge.net/octave/?rev=10710&view=rev
Author:   paramaniac
Date:     2012-07-01 18:50:12 +0000 (Sun, 01 Jul 2012)
Log Message:
-----------
control-devel: add nkshift iddata method

Modified Paths:
--------------
    trunk/octave-forge/extra/control-devel/INDEX

Added Paths:
-----------
    trunk/octave-forge/extra/control-devel/inst/@iddata/nkshift.m

Modified: trunk/octave-forge/extra/control-devel/INDEX
===================================================================
--- trunk/octave-forge/extra/control-devel/INDEX	2012-06-30 18:46:04 UTC (rev 10709)
+++ trunk/octave-forge/extra/control-devel/INDEX	2012-07-01 18:50:12 UTC (rev 10710)
@@ -9,6 +9,7 @@
   @iddata/get
   @iddata/ifft
   @iddata/merge
+  @iddata/nkshift
   @iddata/plot
   @iddata/set
   @iddata/size

Added: trunk/octave-forge/extra/control-devel/inst/@iddata/nkshift.m
===================================================================
--- trunk/octave-forge/extra/control-devel/inst/@iddata/nkshift.m	                        (rev 0)
+++ trunk/octave-forge/extra/control-devel/inst/@iddata/nkshift.m	2012-07-01 18:50:12 UTC (rev 10710)
@@ -0,0 +1,55 @@
+## Copyright (C) 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 -*-
+## @deftypefn {Function File} {@var{dat} =} nkshift (@var{dat}, @var{nk})
+## @deftypefnx {Function File} {@var{dat} =} detrend (@var{dat}, @var{nk} @var{'append'})
+## Detrend outputs and inputs of dataset @var{dat} by
+## removing the best fit of a polynomial of order @var{ord}.
+## If @var{ord} is not specified, default value 0 is taken.
+## This corresponds to removing a constant.
+## @end deftypefn
+
+## Author: Lukas Reichlin <luk...@gm...>
+## Created: July 2012
+## Version: 0.1
+
+function dat = nkshift (dat, nk = 0)
+
+  if (nargin != 2)
+    print_usage ();
+  endif
+
+  if (! is_real_scalar (nk))
+    error ("iddata: nkshift: ");
+  endif
+
+  ## TODO: - nk per inputs
+  ##       - padding with zeros
+  
+  snk = sign (nk);
+  nk = abs (nk);
+
+  if (snk >= 0)
+    dat.y = cellfun (@(y) y(nk+1:end, :), dat.y, "uniformoutput", false);
+    dat.u = cellfun (@(u) u(1:end-nk, :), dat.u, "uniformoutput", false);
+  else
+    dat.y = cellfun (@(y) y(1:end-nk, :), dat.y, "uniformoutput", false);
+    dat.u = cellfun (@(u) u(nk+1:end, :), dat.u, "uniformoutput", false);
+  endif
+
+endfunction

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