Filling an histogram

ROOT
1

hi to everybody, I have been using ROOT for just some days and I have to face this problem: I have a TH2D filled with random numbers. I wanted them to generate a full circle of certain radius r. Some of the bins inside the circle are empty (this is my choice).
Now I want these empty bins to fill, (e.g.with 500 events) but I write

for(i=0;i<nbins; i++)
for(j=0;j<nbins;j++)
if(h->GetBinContent(i,j)!=0)
h->SetBinContent(i,j,h->GetBinContent(i,j));
else
h->SetBinContent(i,j,500);

so all the empty bins are filled. how can I fill the bins inside the circle only? (maybe it’s not properly a ROOT problem…!)
thank you very much
e.l.

2

It is up to you to find out if the bin is inside the circle or not, that is simple geometry.