for i=1:2:39
   if rand<0.9
     cross_pos=round(10*rand);   %交叉位置為0~9，若位置為0或1，則不進(jìn)行交叉操作
     if or(cross_pos==0, cross_pos==10)
        continue;   
     end
     for j=cross_pos+1:9
       temp=pop(i,j);
       pop(i,j)=pop(i+1,j);
       pop(i+1,j)=temp;
     end   %for
     cross_pos=round(10+10*rand);
     if or(cross_pos==10, cross_pos==20)
       continue;
     end
     for j=cross_pos+1:19
       temp=pop(i,j);
       pop(i,j)=pop(i+1,j);
       pop(i+1,j)=temp;
    end   %for
  end
end
clear i;
clear k;
clear j;
clear temp;
clear cross_pos;