Locating an array of a cell into another cell's array

I am tring to locate an array of cell into another one .The code : ___________________________________________________________________________________________________

      u = cell(2, 1);
      for i = 1:2;   
      u{i} = zeros(1,ii);
      end    
      for i=1:ii;   
      x=(i-1)*dx;       
      fikness=fik*sin(pi.*x);
      u{1}=(c1-H1D*(x-0.5)+AD/2.*(x-0.5).^2)./(H1-0.5*fikness-A*(x-0.5));  
      u{2}=(c2+H1D*(x-0.5)-AD/2.*(x-0.5).^2)./(1.-H1+0.5*fikness+A*(x-0.5)); 
      end

      p = cell(2, 1); 
      q = cell(2, 1);

      for i = 1:2; 
         p{i} = zeros(1,ii);
         q{i} = zeros(1,ii);  
      end    

      p{1}(1)=0.5*(1.-u{1}(1).^2); 
      q{1}(1)=0;
      p{2}(1)=0.5*(1.-u{2}(1).^2);
      q{2}(1)=0;

      for i=2:ii      
      q{1}(i)=q{1}(i-1)-dx*(u{1}(i-1)-ub{1}(i-1))./dt;
      p{1}(i)=0.5*(1.-u{1}(i).^2)+q{1}(i);
      q{2}(i)=q{2}(i-1)-dx*(u{2}(i-1)-ub{2}(i-1))./dt;
      p{2}(i)=0.5*(1.-u{2}(i).^2)+q{2}(i);
      end

    `ii=101, dx=0.001, dt=0.0001, t:0:dt:1000`

   written in the code but I did not put them here.

But when I run it Matlab promp says:

??? Attempted to access u.%cell(2); index out of bounds because numel(u.%cell)=1.

Error in ==> grab3_SmithWilson at 75 p{1}(i)=0.5*(1.-u{1}(i).^2)+q{1}(i);

Many thanks