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annotate scripts/signal/spencer.m @ 7017:a1dbe9d80eee

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[project @ 2007-10-12 21:27:11 by jwe]
author jwe
date Fri, 12 Oct 2007 21:27:37 +0000
parents 93c65f2a5668
children c776f063fefe
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1 ## Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2005, 2006,
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2 ## 2007 Friedrich Leisch
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} spencer (@var{x})
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22 ## Return Spencer's 15 point moving average of every single column of
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23 ## @var{x}.
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24 ## @end deftypefn
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26 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
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27 ## Description: Apply Spencer's 15-point MA filter
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29 function retval = spencer (X)
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31 if (nargin != 1)
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32 print_usage ();
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33 endif
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34
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35 [xr, xc] = size(X);
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36
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37 n = xr;
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38 c = xc;
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39
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40 if (isvector(X))
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41 n = length(X);
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42 c = 1;
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43 X = reshape(X, n, 1);
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44 endif
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45
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46 W = [-3, -6, -5, 3, 21, 46, 67, 74, 67, 46, 21, 3, -5, -6, -3] / 320;
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47
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48 retval = fftfilt (W, X);
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49 retval = [zeros(7,c); retval(15:n,:); zeros(7,c);];
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50
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51 retval = reshape(retval, xr, xc);
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52
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53 endfunction
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