need to use Find function

Hello..I already done for this..but when i'm run this program..Lbest should be different answer..but sometimes this program will show or get the same answer for Lbest..so how i need to do with this program by using find function to solve this problem..thank you for your helping me to solve this problem..

% Gravitational Search Algorithm. function [Fbest,Lbest,BestChart,MeanChart]=GSA(F_index,N,max_it,ElitistCheck,min_flag,Rpower)

%V: Velocity. %a: Acceleration. %M: Mass. Ma=Mp=Mi=M; %dim: Dimension of the test function. %N: Number of agents. %X: Position of agents. dim-by-N matrix. %R: Distance between agents in search space. %[low-up]: Allowable range for search space. %Rnorm: Norm in eq.8. %Rpower: Power of R in eq.7.

 Rnorm=2;

%get allowable range and dimension of the test function. [low,up,dim]=test_functions_range(F_index);

%random initialization for agents. X=initialization(dim,N,up,low);

%create the best so far chart and average fitnesses chart. BestChart=[];MeanChart=[];

V=zeros(N,dim);

%find function %find(Lbest);

for iteration=1:max_it % iteration

    %Checking allowable range. 
    X=space_bound(X,up,low); 

    %Evaluation of agents. 
    fitness=evaluateF(X,F_index); 

    if min_flag==1
    [best best_X]=min(fitness); %minimization.
    else
    [best best_X]=max(fitness); %maximization.
    end        

    if iteration==1
       Fbest=best;Lbest=X(best_X,:);
    end
    if min_flag==1
      if best<Fbest  %minimization.
       Fbest=best;Lbest=X(best_X,:);
      end
    else 
      if best>Fbest  %maximization
       Fbest=best;Lbest=X(best_X,:);
      end
    end

BestChart=[BestChart Fbest]; MeanChart=[MeanChart mean(fitness)];

%Calculation of M. eq.14-20 [M]=massCalculation(fitness,min_flag);

%Calculation of Gravitational constant. eq.13. G=Gconstant(iteration,max_it);

%Calculation of accelaration in gravitational field. eq.7-10,21. a=Gfield(M,X,G,Rnorm,Rpower,ElitistCheck,iteration,max_it);

%Agent movement. eq.11-12 [X,V]=move(X,a,V);

end %iteration

Hello..I already done for this..but when i'm run this program..Lbest should be different answer..but sometimes this program will show or get the same answer for Lbest..so how i need to do with this program by using find function to solve this problem..thank you for your helping me to solve this problem..