function [X, f1] = DeJong1(Xi)
n = 2;             
Xi = 0;                    %setting boundary  
LL = -5.12;              %Lower limit
UL = 5.12;               %Upper limit
X = LL+rand(1,n)*(UL-LL);
f1 = X(1).^2 + X(2).^2;
end