function summa=halfsum(A)
summa=0;
n=length(A);
k=1;
[m,p]=size(A);
if m~=p
if p>m
A(p,p)=0;
elseif m>p
A(m,m)=0;
end
end
for i=1:n
for j=k:n
summa=summa+A(i,j);
end
k=k+1;
end
end
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