Mercurial > octave-nkf
view scripts/signal/periodogram.m @ 7016:93c65f2a5668
[project @ 2007-10-12 06:40:56 by jwe]
author | jwe |
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date | Fri, 12 Oct 2007 06:41:26 +0000 |
parents | 4c8a2e4e0717 |
children | a1dbe9d80eee |
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## Copyright (C) 1995, 1996, 1997 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} {} periodogram (@var{x}) ## For a data matrix @var{x} from a sample of size @var{n}, return the ## periodogram. ## @end deftypefn ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at> ## Description: Compute the periodogram function retval = periodogram (x) [r, c] = size(x); if (r == 1) r = c; endif retval = (abs (fft (x - mean (x)))) .^ 2 / r; endfunction