function pop=crosser(p)
[row,column]=size(p);
for j=1:2:row-1
    m=ceil(rand()*column);%產生一個交叉點
    for i=m+1:column
        mid=p(j,i);
        p(j,i)=p(j+1,i);
        p(j+1,i)=mid;
    end
end
pop=p;