/usr/share/octave/packages/3.2/tsa-4.1.0/biacovf.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 36 37 38 39 40 41 42 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));
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