Filling a histogram with weight from other histogram

Hi,

I would like to fill a histogram from a TNtuple and get the fill weight from another histogram, depending on a variable from the ntuple.

I tried

    nt->Draw("pt", "eff->GetBinContent(eff->FindBin(pt))")

where `nt` is a `TNtuple` and `eff` a `TH1` in the variable pt.

However at the cint prompt already getting the weight fails:

   root [18] eff
   (class TH1F*)0x9533f60)]
   root [19] eff->GetBinContent(eff->FindBin(0.2))    Error: Symbol eff is not defined in current scope (tmpfile):1:    Error: Failed to evaluate eff->FindBin(0.2)

• Interpreter error recovered ***

What is the correct way to do this?

Cheers,

Benjamin

-- 
"Good judgment comes from experience. Experience comes from bad judgment."






application/pgp-signature attachment: Digital signature