function [fval]=unc_nn_dejong1(x)
%reference:
%note that you can get the formulation of unc_n2_dejong1 from some
%aritcles,such as
%(1)Hartmut Pohlheim 'Genetic Algorithm Toolbox Test Functions'
%
%algorithm:
%below code is  edited according to 
%(1)Hartmut Pohlheim 'Genetic Algorithm Toolbox Test Functions'
%
%solution:
% where the bounds are -5.12<=x<=5.12;
% The global minimum is at x*=zeros(n,1),and f(x*)= 0;
%It is continuos, convex and unimodal.

%Copyright:
% programmers:oiltowater.
% It comply with the GPL2.0
% Copyright 2006  oiltowater 


n=size(x,1);
suma=0;
for i=1:n
    suma=suma+i*x(i,1)*x(i,1);
end



fval=suma;