?? construction.m
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% encode as MacKay
function [H]=construction(h);
[m,n]=size(h);
%%% m denote the number of column M
%%% n the number of 1 in each row
%%% we only consider the R=0.5 matrix
H=zeros(m/2,m);
for i=1:m,
for j=1:n,
H(h(i,j),i)=1;
end
end
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