/usr/share/octave/packages/3.2/tsa-4.1.0/sbispec.m is in octave-tsa 4.1.0+svn20110501-1.
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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 35 | function sbispec(BISPEC)
% SBISPEC show BISPECTRUM
% $Id: sbispec.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/>.
[s1,s2]=size(BISPEC);
t1=(0:s1-1)/max(s1);
t2=(0:s2/2-1)/max(s2);
tmp=tril(NaN*ones(s1,s2),-1);
BISPEC=BISPEC+tmp+rot90(tmp);
BISPEC=BISPEC(1:s1/2,:);
subplot(211);
mesh(t1,t2,abs(BISPEC));
title('Bispectrum - mesh plot');
subplot(212);
contour(t1,t2,abs(BISPEC));
%contour(t1,t2,log(abs(BISPEC)));
title('Bispectrum - contour plot');
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