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k24f.m
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k24f.m
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% function [k24]=k24f(k4,A)
%
% k02 is the second order component of the Wiener series corresponding to
% the fourth order Wiener kernel k4.
% A it's the power of input sequence.
% Refer to the documentation and references provided
%
% If you want to contact the authors, please write to [email protected],
% or Simone Orcioni, DII, Università Politecnica delle Marche,
% via Brecce Bianche, 12 - 60131 Ancona, Italy.
% Copyright (C) 2006 Massimiliano Pirani
%
% 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 2 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, write to the Free Software Foundation, Inc.,
% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
function k24=k24f(k4,A)
R4=size(k4,1);
diag=zeros(R4,1);
k24=zeros(R4,R4);
for sgm1=1:R4
for sgm2=1:R4
for tau1=1:R4,diag(tau1)=k4(tau1,tau1,sgm1,sgm2);end
k24(sgm1,sgm2)=sum(diag);
end
end
k24=-6*A*k24;