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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | % BISDEMO (script) Shows BISPECTRUM of eeg8s.mat
% $Id: bisdemo.m 5090 2008-06-05 08:12:04Z schloegl $
% Copyright (C) 1997, 1998,2008 by Alois Schloegl <a.schloegl@ieee.org>
%
% 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 3 of the License, 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 program. If not, see <http://www.gnu.org/licenses/>.
load eeg8s.mat;
[BISPEC,BICOV,ACF]=bispec(eeg8s,30);
[s1,s2]=size(BISPEC);
t1=(1:s1)/max(s1);
t2=(1:s2)/max(s2);
subplot(211);
mesh(t1,t2,abs(BISPEC));
title('Bispectrum - mesh plot');
subplot(212);
if exist('OCTAVE_VERSION')>5
contour(abs(BISPEC),10,t1,t2);
else
contour(t1,t2,abs(BISPEC),10);
end;
title('Bispectrum - contour plot');
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