错误：单元格内容索引必须大于0

Question

您好我不断收到以下代码的错误：

p1是一组细胞 pLeft，pRight，pUp，pDown只是p1在一个方向上旋转

for m =randperm(N^2);

 format long 
 guess= rand;
 zz=[4,5,6,7];
 zzz={pLeft{m},pRight{m},pUp{m},pDown{m}};
 swapmap=containers.Map(zz,zzz);
 zzzz={mod(m-N,N^2),mod(m+N,N^2),mod(m-1,N^2),mod(m+1,N^2)};
 swapmap2=containers.Map(zz,zzzz);
 direction=randperm(4)+3;


   if  p1{m}(direction(1))>guess
    [p1{m}, swapmap(direction(1))] = deal(swapmap(direction(1)),p1{m});
     p1{swapmap2(direction(1))}=swapmap(direction(1));    
  end
   if  p1{m}(direction(2))>guess
    [p1{m},swapmap(direction(2))] = deal(swapmap(direction(2)),p1{m});
     p1{swapmap2(direction(2))}=swapmap(direction(2));   
   end
    if  p1{m}(direction(3))>guess
     [p1{m}, swapmap(direction(3))] = deal(swapmap(direction(3)),p1{m});
     p1{swapmap2(direction(3))}=swapmap(direction(3));   
    end
    if  p1{m}(direction(4))>guess
     [p1{m},swapmap(direction(4))] = deal(swapmap(direction(4)),p1{m});
      p1{swapmap2(direction(4))}=swapmap(direction(4));   
    end

端

我收到以下错误

Cell contents indices must be greater than 0

  Error in test3 (line 114)
    p1{swapmap2(direction(2))}=swapmap(direction(2));