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annotate scripts/signal/spencer.m @ 3457:e031284eea27

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[project @ 2000-01-19 08:49:56 by jwe]
author jwe
date Wed, 19 Jan 2000 08:50:14 +0000
parents 858695b3ed62
children 38c61cbf086c
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1 ## Copyright (C) 1995, 1996, 1997 Friedrich Leisch
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2 ##
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3 ## This program is free software; you can redistribute it and/or modify
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4 ## it under the terms of the GNU General Public License as published by
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5 ## the Free Software Foundation; either version 2, or (at your option)
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6 ## any later version.
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7 ##
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8 ## This program is distributed in the hope that it will be useful, but
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9 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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11 ## General Public License for more details.
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12 ##
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13 ## You should have received a copy of the GNU General Public License
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14 ## along with this file. If not, write to the Free Software Foundation,
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15 ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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17 ## -*- texinfo -*-
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18 ## @deftypefn {Function File} {} spencer (@var{x})
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19 ## Return Spencer's 15 point moving average of every single column of
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20 ## @var{x}.
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21 ## @end deftypefn
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23 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
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24 ## Description: Apply Spencer's 15-point MA filter
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26 function retval = spencer (X)
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28 if (nargin != 1)
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29 usage ("spencer (X)");
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30 endif
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32 [xr, xc] = size(X);
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34 n = xr;
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35 c = xc;
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37 if (is_vector(X))
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38 n = length(X);
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39 c = 1;
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40 X = reshape(X, n, 1);
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41 endif
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43 W = [-3, -6, -5, 3, 21, 46, 67, 74, 67, 46, 21, 3, -5, -6, -3] / 320;
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45 retval = fftfilt (W, X);
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46 retval = [zeros(7,c); retval(15:n,:); zeros(7,c);];
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48 retval = reshape(retval, xr, xc);
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50 endfunction
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