Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / tsa-4.2.4 / sbispec.m

diff --git a/octave_packages/tsa-4.2.4/sbispec.m b/octave_packages/tsa-4.2.4/sbispec.m
new file mode 100644 (file)
index 0000000..2576e59
--- /dev/null
+++ b/octave_packages/tsa-4.2.4/sbispec.m
@@ -0,0 +1,35 @@
+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');