Unable getting the integral form the histo

[michael91]

Hey all, I believe my problem is trivial but I can not sole it.

I have a file with the integral in it, just want to get the Integral of the histo.
Below I attach my code.

void makehisto()
{
//Loading the files
TFile *f = new TFile(“GE11-VII-S-CERN-0002_Runs112-115.root”);
f->cd(“SectorEta1”);

 TH1F *h1 = (TH1F*)f->Get("h_iEta1_hitPos"); 
 double Inthisto = double(h1->Integral());

}

Thank you in advance for your help!

[ganis]

Dear michael91,

Not sure to understand what the problem is. Do you get a crash or a weird value for the integral?
Anyhow, your code looks fine.
I would just make sure that ’ f->Get ’ returns a histogram object, i.e. that the histogram is really found in the file and it is as you expect.

G Ganis

[Pepe_Le_Pew]

Try:
TH1F *h1; gDirectory->GetObject(“h_iEta1_hitPos”, h1);