Using struct instead of class

Hi, I have the code below and I used struct instead of the class , but I'm receiving error ( Index exceed matrix dimension) the error is in shekel function ??:

 clc;
 clear al;
 close all;

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    Population_Size = 50;
    Dimension = 2;
    upperLimit = 50;
    lowerLimit = -50;
    R_1 = 1; 
    R_2 = -0.5;        
    V_1 = 1;  
 V_2 = 1; 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% use struct instead of class in c#

    CCll = struct('f',[],'p',[],'c',[]);

    Best_Clls =struct('f',[],'p',[],'c',[]);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    range = upperLimit - lowerLimit;

    randGenerate = rand()* range + lowerLimit;

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   CCll.f= realmax;

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    for i = 1:Population_Size
     for j = 1:Dimension 

        CCll(i).p(j)= randGenerate;

        x= CCll(i).p(j);

        CCll.f=Shekel(x);
          if (CCll(i).f < Best_Clls.f) 
           Best_Clls.f = CCll(i).f;
             Best_Clls.p = CCll(i).p;
                end 
           end  
     end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

the Function is :

   function foxholes = Shekel(x)
   [xSize, Dim] = size(x);
   i=1;

   a=[-32 -16 0 16 32 -32 -16 0 16 32 -32 -16 0 16 32 -32 -16 0 16 32 -32 -16 0 16 32 

   -32 -32 -32 -32 -32 -16 -16 -16 -16 -16 0 0 0 0 0 16 16 16 16 16 32 32 32 32 32];

   ss=zeros(xSize,25);

    for j=1:25
    ss(:,j)=j+(x(:,1)-a(i,j)).^6+(x(:,2)-a(i+1,j)).^6;
    end
   ss=ss.^(-1);
   r=sum(ss')';
   foxholes=(1/500+r).^(-1);
   end

[KSSV]

your x which is input to shekel is a scalar (1x1) and you are trying to access x(:,1), x(:,2) inside the function. You have to consider on this point.