## Copyright (C) 1995, 1996, 1997 Friedrich Leisch ## ## This program 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 2, or (at your option) ## any later version. ## ## This program 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 this file. If not, write to the Free Software Foundation, ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ## usage: periodogram (x) ## ## For a data matrix x from a sample of size n, return the periodogram. ## 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

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