X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Ftsa-4.2.4%2Fbiacovf.m;fp=octave_packages%2Ftsa-4.2.4%2Fbiacovf.m;h=99eea6900b6d2a9bbd60594c4694c385db935219;hp=0000000000000000000000000000000000000000;hb=c880e8788dfc484bf23ce13fa2787f2c6bca4863;hpb=1705066eceaaea976f010f669ce8e972f3734b05

diff --git a/octave_packages/tsa-4.2.4/biacovf.m b/octave_packages/tsa-4.2.4/biacovf.m
new file mode 100644
index 0000000..99eea69
--- /dev/null
+++ b/octave_packages/tsa-4.2.4/biacovf.m
@@ -0,0 +1,43 @@
+function [BIACF,ACF,M1] = biacovf(Z,N);
+% BiAutoCovariance function 
+% [BiACF] = biacovf(Z,N);
+%
+% Input:	Z    Signal
+%		N  # of coefficients
+% Output:	BIACF bi-autocorrelation function (joint cumulant 3rd order
+% Output:	ACF   covariance function (joint cumulant 2nd order)
+
+%       $Id: biacovf.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/>.
+
+ACF=zeros(1,N+1);
+BIACF=zeros(N+1,N+1);
+
+Z=Z(:);
+M=size(Z,1);
+
+M1=sum(Z)/M;
+Z=Z-M1*ones(size(Z));
+
+for K=0:N, 
+	tmp=Z(1:M-K).*Z(1+K:M);
+	ACF(K+1)=sum(tmp)/M;
+	for L = K:N,
+		BIACF(K+1,L+1) = sum(tmp(1:M-L).*Z(1+L:M))/M;
+	end;
+end;
+
+BIACF=BIACF+BIACF'-diag(diag(BIACF));