select.m

function ret=select(individuals,sizepop)
% 该函数用于进行选择操作
% individuals input    种群信息
% sizepop     input    种群规模
% ret         output   选择后的新种群
%求适应度值倒数  
[a bestch]=min(individuals.fitness);
%b=individuals.chrom(bestch);
%c=individuals.fitness(bestch);
fitness1=10./individuals.fitness; %individuals.fitness为个体适应度值
%个体选择概率
sumfitness=sum(fitness1);
sumf=fitness1./sumfitness;
%采用轮盘赌法选择新个体
index=[];
for i=1:sizepop   %sizepop为种群数
    pick=rand;
    while pick==0   
        pick=rand;       
    end
    for i=1:sizepop   
        pick=pick-sumf(i);       
        if pick<0       
            index=[index i];           
            break; 
        end
    end
end
%index=[index bestch];
%新种群
individuals.chrom=individuals.chrom(index,:);   %individuals.chrom为种群中个体
individuals.fitness=individuals.fitness(index);
%individuals.chrom=[individuals.chrom;b];
%individuals.fitness=[individuals.fitness;c];
ret=individuals;%出售各类算法优化深度极限学习机代码392503054