volumeofsphere matlab function need help

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gracias claude 2021-4-11

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https://ww2.mathworks.cn/matlabcentral/answers/799017-volumeofsphere-matlab-function-need-help

编辑： dpb 2021-4-11

I put 10^4 into the function and I should be expecting Number of points inside sphere to be 3 and the area should be 0.0024. Am I missing something if so what do I need to change ?

function volumeofsphere3(n)
  ds = RandStream.getGlobalStream;
  reset(ds);
  x=2*rand(n,1);
  y=rand(n,1);
  z=rand(n,1);
  count=0
  for i=1:n
    r=sqrt((x(i)-1/3)^2+(y(i)-1/3)^2+(z(i)-1/2)^2);
    if r<=0.04
      count=count+1;
    end
  end
  fprintf(1,'Number of points inside sphere: %d\n', count)
  Area_of_Sphere=8*(count/n)
end       