hi please help me to fix this error: Attempt to reference field of non-structure array,

I am trying to run this code:

function [bestX,bestFitness,bestFitnessEvolution,RESULTS,nEval]=PSO_v2(options)
bestFitnessEvolution=[];
nEval=0;
ProblemSize=options.ProblemSize;
PopulationSize=options.PopulationSize;
minPosition=options.minPosition;
maxPosition=options.maxPosition;
MaxIter=options.MaxIter;
ObjFunction=options.ObjFunction;
ObjFunctionDisplay=options.ObjFunctionDisplay;
c1=options.c1;
c2=options.c2;
w=options.w;
d=abs(maxPosition-minPosition);
Pposition=zeros(PopulationSize,ProblemSize);
Pvelocity=rand(PopulationSize,ProblemSize);

for i=1:ProblemSize
    Pposition(:,i)=minPosition(i)+rand(PopulationSize,1)*(maxPosition(i)-minPosition(i));
    Pvelocity(:,i)=-d(i)+2*rand(PopulationSize,1)*d(i);
end

P_cost=feval(ObjFunction,Pposition,options);
nEval=nEval+length(P_cost);

Pp_best_cost=P_cost;
Pp_best=Pposition;

but i get this error:

Attempt to reference field of non-structure array.

Error in PSO_v2 (line 17)

ProblemSize=options.ProblemSize;

please how can i fix this error

[Sajid Afaque]

please try to put your code using code section for better readability

%put your code like this

Answer 1

[KSSV]

The input which you are using i.e. options should be a structure with fields

ProblemSize
PopulationSize
minPosition
maxPosition

Check your input. Is it a structure? Use class for this. If it is a structure check does it have those fields.

[James Kossi]

ok thanks