index exceeds the number of array elements (1).

fobj=min(e);
Max_iter=20;
N=30;
dim=2;
lb=[2;1000];
ub=[15;10000];
if size(ub,1)==1
    ub=ones(dim,1)*ub;
    lb=ones(dim,1)*lb;
end
%Initialize the population of grasshoppers
if size(ub,1)==1
    X=rand(N,dim).*(ub-lb)+lb;
end
if size(ub,1)>1
    for i=1:dim
        high=ub(i);
        low=lb(i);
        X(:,i)=rand(1,N).*(high-low)+low;
    end
end

X1=round(X);
GrassHopperPositions=X1;
GrassHopperFitness = zeros(1,N);
fitness_history=zeros(N,Max_iter);
position_history=zeros(N,Max_iter,dim);
Convergence_curve=zeros(1,Max_iter);
Trajectories=zeros(N,Max_iter);

cMax=1;
cMin=0.00004;

%Calculate the fitness of initial grasshoppers

for i=1:size(GrassHopperPositions,1)
    GrassHopperFitness(1,i)=fobj(GrassHopperPositions(i,:));
    fitness_history(i,1)=GrassHopperFitness(1,i);
    position_history(i,1,:)=GrassHopperPositions(i,:);
    Trajectories(:,1)=GrassHopperPositions(:,1);
end
    

[Pavan Malghan]

Kindly help me in solving the issue. i have written in bold where i am getting that error. Hoping for the best solution

Answer 1

[KSSV]

This error occurs when you try to extract more number of elements than present in the array.

EXample:

A = rand(1,10) ;
A(1)   % no error
A(5)  % no error
A(end)  % no error
A(11)  % error, as there are only 10 elements and you cannot extract 11th one. 

Check your dimensions of the array and fix you loop indices.

[Pavan Malghan]

thank you very much sir. I will go through it