说明：  遗传算法，寻找f(x,y)=sinx*siny/(x*y)的最大适应值及其相应的位置。精度为0.0001种群数设定为50
(Genetic algorithm, to find f (x, y) = sinx* siny/(x* y) the greatest value and its corresponding position. Accuracy of 0.0001 set to 50 the number of stocks)