%交叉 crossover
%pc:交叉概率
%pp:群體交叉比例
function pop=crossover(pop,pp,pc,nStrLen)   
nc=round(size(pop,1)*pp/2);
for i=1:nc
    one=round(rand*(size(pop,1)-1)+1);
    two=round(rand*(size(pop,1)-1))+1;
    while(one==two)
        two=round(rand*(size(pop,1)-1))+1;
    end
    parent1=pop(one,:);
    parent2=pop(two,:);
    if(rand<pc)
        cpoint=round(rand*(nStrLen-1))+1; %隨機(jī)生成交叉點
        child1=[parent1(1:cpoint),parent2(cpoint+1:nStrLen)]; %交叉
        child2=[parent2(1:cpoint),parent1(cpoint+1:nStrLen)];
        %對交叉的二個體適應(yīng)度計算
        v=[child1;child2];
        v=fitness(v,nStrLen);
        pop(one,:)=v(1,:);
        pop(two,:)=v(2,:);
    end
end %for
end