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clc
clear all
lp=50;
a=-lp:1:lp;
xh=length(a);
tic
for i=1:1:xh
    for j=1:1:xh
        for k=1:1:xh
            rt(i,j,k)=a(i)^3+a(j)^3+a(k)^3;
        end
    end
end
toc

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clc
clear all
lp=50;
a=-lp:1:lp;
a = a.^3;
a = transpose(a);
xh=length(a);
tic
A = repmat(a,[1,xh,xh]);
B = permute(A,[2,1,3]);
C = permute(A,[3,2,1]);
R = A + B + C;
toc
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