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ÆäÖÐc1=20,n=2

function y = fun(x)
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%x           input           ÊäÈëÁ£×Ó
%y           output          Á£×ÓÊÊÓ¦¶ÈÖµ

y=-20*exp(-0.2*sqrt((x(1)^2+x(2)^2)/2))-exp((cos(2*pi*x(1))+cos(2*pi*x(2)))/2)+20+exp(1);

%y=x(1)^2-10*cos(2*pi*x(1))+10+x(2)^2-10*cos(2*pi*x(2))+10;
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