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annotate scripts/signal/periodogram.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 f084ba47812b
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1 ## Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2005, 2007
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2 ## 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} {} periodogram (@var{x})
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22 ## For a data matrix @var{x} from a sample of size @var{n}, return the
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23 ## periodogram.
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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: Compute the periodogram
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29 function retval = periodogram (x)
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31 [r, c] = size(x);
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33 if (r == 1)
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34 r = c;
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35 endif
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36
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37 retval = (abs (fft (x - mean (x)))) .^ 2 / r;
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38
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39 endfunction
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