A Question on a Simple Loop

Hello. My problem: We have 5 machines. We wanna play each of these machines 1000 times (we call each 1000 plays a TASK). In each time, the machine gives us a reward (randomly). We wanna check that the mean reward of which one of these TASKs is more than others (maximum). I wrote this code but it doesn't work well. Why?

      for j=1:5
  h=0;
  for i=1:1000
      rew=randn(1);
      sum=rew+h;

end

mean(j)=sum./1000; [value,index]=max(mean(j))

end end

Thanks in advance

[Walter Roberson]

Do not use "sum" as the name of a variable or you will almost always encounter problems with sum() being the name of a useful MATLAB function.

[Zahra kamkar]

Thanks a lot

Answer 1

[Walter Roberson]

You never update "h" so at each point "sum" will be assigned only the latest random value.