Some variables not being shown in workspace

I am implementing an optimisation heuristic algorithm in matlab. When I run it, some of the variables are not coming up in workspace. When I run that variable (say xyz) from Command window, it says undefined variable xyz. Though I can see that variable xyz is defined in the program. Program was running well until day before yesterday but suddenly why are such problems coming. Why is this happening? The program is attached

clc;
clear;
close all;

INITIAL PARAMETERE VALUE

N=5;TS=100;LB=[1 0.1 0.1 0.1 0.1];UB=[50 30 25 0.99 0.99];ITER=2000;
Costfunction= @pidisefrac2;

INITIAL POPULATION

Individual.Position=zeros(1,N);
Individual.Cost=zeros(1,1);
Pop=repmat(Individual,TS,1);
for i=1:TS
    for j=1:5
    Pop(i).Position(j)=unifrnd(LB(j),UB(j),1,1);
    end
    Pop(i).Cost=Costfunction(Pop(i).Position);
end

EVALOTUNARY SECTION

for i=1:ITER
    for j=1:N
        sum1=0;
        sum2=0;
        for k=1:TS
            sum1=sum1+Pop(k).Position(j)*(1/Pop(k).Cost);
            sum2=sum2+1/Pop(k).Cost;
        end
        Center(j)=sum1/sum2;
    end

      for j = 1:5
      c=(0.5*(UB-LB))/(1+ITER/10);
      end

      for k=1:TS-1
          for j= 1:5
      Pop(k).Position(j)=Center(j)+c(j)*normrnd(0,1,1,1);
          end
          for j=1:N
              if Pop(k).Position(j)<LB
                  Pop(k).Position(j)=LB;
              end
              if Pop(k).Position(j)>UB
                  Pop(k).Position(j)=UB;
              end      
          end
      Pop(k).Cost=Costfunction(Pop(k).Position);
      end
      Pop(end).Position=Center;
      Pop(end).Cost=Costfunction(Center);

      Costs=[Pop.Cost];

      [BestCost(i) index] = min(Costs)
      BestmPosn (i,:) = Pop(index).Position;

end

RESULT

Costs=[Pop.Cost];  
BestCost = min(Costs)

pidisefrac2.m

function ise = pidisefrac2(x)

sys = fotf([0.08 1.88 0],[2 1 0],[1.8],[0]);

pidi = fotf([1 0],[x(4) 1],[x(3) x(1) x(2)],[x(4)+x(5) x(4) 0]);
sysnew = sys*pidi;
final = feedback(sysnew,1);
%finalWithoutPID = tf([0.01125],[0.0005 0.01175 0.01125]);

[y t]=step(final,0:0.001:10);
ac =stepinfo(y,t,1);
 % step(final)
for i = 1:101
error(i) =1 - y(i);
end
error1=error*error';
ise=abs(sum(error1));

[José-Luis]

Please provide some minimum working example reproducing your problem.

[Rakesh Jain]

It is a full working example. Please tell why is it happening

[Stephen23]

@Rakesh Jain: and which variables can you not find in the base workspace?

[José-Luis]

Are you trying to access variables others than ise in the workspace after you run the function?

That ain't gonna happen.

You need to return them or place a breakpoint (at the right place) inside the function to be able to see them.

[Rakesh Jain]

BestCost, BestmPosn

[Stephen23]

I do not have the FOTF toolbox which you seem to be using, but when I replace the cost function with:

Costfunction = @(varargin)1;

then the script runs without error, and returns:

BestCost =
     1
>> BestmPosn
BestmPosn =
       25.587       16.222       13.446      0.50843      0.51146
       25.423        16.34       13.621      0.50816      0.51123
       25.631       16.285        13.56      0.50519      0.51467
        25.42       16.233       13.448      0.50802      0.51374
       25.414       16.294       13.555      0.50112      0.51198
       25.436       16.287       13.507      0.50512      0.51118
       etc.

[Rakesh Jain]

The mistake was mine. I had taken time to be 0:0.001:10. Thus the processing time increased and thus it was taking longer time. I was using ctrl+C earlier to break the program. Another question : if I uncomment the sixth last line step(final), the graph of the response which shows up is for 0.1 second. What if i want to check the response till 1 second or say 5 seconds