i am trying to execute the problem code but i am getting error in this line "Linedata(​​​n1+k,:)=​C​a​ndidat​e(​sw​1(k)​,:)​;"

i am trying to execute this problem code but i am getting error in it.

function f=bench_func(x)
  [ps,d]=size(x);
  %Transmission Network Expansion Planning 
  % Maximum and minimum bound of the population that to be generated is 1 and 16.  
      sw=ceil(x);
      data6Bus;
      n1=length(Linedata(:,1));
      sw1=sw;
      for k=1:length(sw1)
          Linedata(n1+k,:)=Candidate(sw1(k),:);
      end
      n_orginalLine=n1;
      n=length(Pgen);
      B=zeros(n,n);
      Nline=length(Linedata(:,1));
      %Ncand=max(Candidate(:,1));
      Xline=Linedata(:,4);
      pijmax=Linedata(:,6);
      Tap=ones(n);
      for C=1:Nline
          bline(C)=1/Xline(C);
          k=Linedata(C,2);
          m=Linedata(C,3);
          B(k,m)=B(k,m)-(bline(C));
          B(m,k)=B(k,m);
          B(k,k)=B(k,k)+(bline(C));
          B(m,m)=B(m,m)+(bline(C));
      end    
  B(1,1)=10000000;
  X=inv(B);
  delP= Pgen-Pload;
  delP=(delP');
    delta=X*(delP);
    pij=zeros(Nline,1);
    for k=1:Nline
        i=Linedata(k,2);
        j=Linedata(k,3);
        pij(k)=(delta(i)-delta(j))/Xline(k);
    end
    PIPbase=0.0;
    f=sum(Linedata(n_orginalLine+1:end,7))+30;
    pen=0;
    for i=1:length(Linedata(:,1))
        pen=pen+5000*max((abs(pij(i))-Linedata(i,6)),0);
    end
    for i=1:length(Candidate(:,1))
        [a ]=find(sw==i);
        if length(a)>3
            pen=pen+1000;
        end
    end
    f=f+pen;

inputs:

d=7; Ub=15; Lb=0;

error:

Attempted to access Candidate(-5,:); index must be a positive integer or logical.
    Error in algorithm>bench_func (line 112)
            Linedata(n1+k,:)=Candidate(sw1(k),:);
    Error in algorithm (line 60)
               Fnew=bench_func(S(i,:));

[Walter Roberson]

duplicates http://uk.mathworks.com/matlabcentral/answers/238657-i-am-trying-to-execute-the-problem-code-but-i-am-getting-error-in-this-line-linedata-n1-k-candid