X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fm%2Fsignal%2Fspencer.m;fp=octave_packages%2Fm%2Fsignal%2Fspencer.m;h=4ffd07301d6ac70a7435fc52fd76c2f186be9d8b;hp=0000000000000000000000000000000000000000;hb=1c0469ada9531828709108a4882a751d2816994a;hpb=63de9f36673d49121015e3695f2c336ea92bc278

diff --git a/octave_packages/m/signal/spencer.m b/octave_packages/m/signal/spencer.m
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+++ b/octave_packages/m/signal/spencer.m
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+## Copyright (C) 1995-2012 Friedrich Leisch
+##
+## This file is part of Octave.
+##
+## Octave 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.
+##
+## Octave 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 Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} spencer (@var{x})
+## Return Spencer's 15 point moving average of each column of
+## @var{x}.
+## @end deftypefn
+
+## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
+## Description: Apply Spencer's 15-point MA filter
+
+function retval = spencer (x)
+
+  if (nargin != 1)
+    print_usage ();
+  endif
+
+  [xr, xc] = size(x);
+
+  n = xr;
+  c = xc;
+
+  if (isvector(x))
+   n = length(x);
+   c = 1;
+   x = reshape(x, n, 1);
+  endif
+
+  w = [-3, -6, -5, 3, 21, 46, 67, 74, 67, 46, 21, 3, -5, -6, -3] / 320;
+
+  retval = fftfilt (w, x);
+  retval = [zeros(7,c); retval(15:n,:); zeros(7,c);];
+
+  retval = reshape(retval, xr, xc);
+
+endfunction
+