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k13f.m
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k13f.m
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% function k13=k13f(k3)
%
% k13 is the first order component of the Wiener series corresponding to
% the third order Wiener kernel k3.
% 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 k13=k13f(k3,A)
R3=size(k3,1);
diag=zeros(R3,1);
k13=zeros(R3,1);
for sgm1=1:R3
for tau1=1:R3
diag(tau1)=k3(tau1,tau1,sgm1);
end
k13(sgm1)=sum(diag);
end
k13=-3*A*k13;