function [z, x, y] = gaFun(population)
% Lasketaan funktion arvo sekä x ja y
[x y] = gaDecode(population);   
z = 10 + 3*(1-x).^2.*exp(-(x.^2)-(y+1).^2) - 10*(x/5 - ...
    x.^3 - y.^5).*exp(-x.^2-y.^2) - 1/3*exp(-(x+1).^2-y.^2);