Integrating over a histogram

How do you integrate over a histogram? Like splitting up histogram into sections with each section in a bin? this is what I have.

TH1D *h1=new TH1D(“h1”,”Rings”,400,0,1300)

I’m not sure I understand your question. What you do seems correct, see the documentation of TH1D::Integral (Int_t binx1, binx2, *option="")

@bellenot mentioned - what you are doing is correct.

Just in case, you are putting ; after


then remove it and try!

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