Integral with a defined bin range

[Cellamare]

Hi guys,

maybe it’s a stupid question but I think I didn’t get really the meaning of the TH1::Integral() method with a defined bin range.

If I have a histo defined as h(“title”,“title”,23,1,24)

and I take h->Integral(2,24)

what is the integration range I’m considering?

---

Please read tips for efficient and successful posting and posting code

ROOT Version: Not Provided
Platform: Not Provided
Compiler: Not Provided

---

[Wile_E_Coyote]

h->GetXaxis()->GetBinLowEdge(2) … h->GetXaxis()->GetBinUpEdge(24)

Note that bin 24 is the “overflow bin” in your case, so when filling it will “collect” everything from h->GetXaxis()->GetBinLowEdge(24) to “infinity”.

[Axel]

h(“title”,“title”,23,1,24)

means your histogram has 23 bins, where the lower bin border is 1.0 and the upper is 24.0. So the bin number 1 goes from 1.0 to 2.0, bin number 2 from 2.0 to 3.0 etc.

Integral(2,24) gets the sum of the bin content for bins 2 to 24. Now - that bin 24 is special, it’s the bin that contains everything “to the right” of the histogram, i.e. all Fill() with values > 24.

Makes sense?

[Cellamare]

Thank you guys