select.m

免疫遗传算法用于搜索全局最优解,经验证具有很好的效率和收敛性

% 函数 - 轮盘赌选择要交叉的个体
function Num = select(sumfitness,oldpop,gen,maxgen)


popsize = length(oldpop);

Psum = 0;

if(sumfitness ~= 0)
    for i = 1:popsize
        P(i) = oldpop(i).fitness/sumfitness;  % 计算个体适应度值对应的选择概率
    end
    pick = rand(1,1)*sum(P);    % 随机选取一点，落入位置即为选中个体  
    for i=1:popsize
        if(Psum < pick)
            Psum = Psum + P(i);
        else
            break
        end
    end
else
    i = ceil(rand(1,1)*(popsize-1)) + 1;
end

Num = i;