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## 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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