Re: [ROOT] Getting mean of Ntuple variables

From: Pasha Murat (murat@fnal.gov)
Date: Wed Mar 13 2002 - 23:01:07 MET


Hi Aron, ROOT has a very nice manual and you'll find the answer to your 
question (as well as to many others) in there. See http://root.cern.ch.
In words, you need to fill a histogram and then to ask a histogram for 
its mean etc. -best, Pasha


On Wed, 13 Mar 2002 13:19:55 -0800
"Aron, Navneet" <navneet@SLAC.stanford.edu> wrote:

> 
> Hi,
> Can any one tell me how do we get the mean , rms values of  the various ntuple variables in the root file.
> My try is as follows: 
> 
> {
> gROOT->Reset();
> TFile *r = new TFile("g1onaxis.root");
> TTree *tree = (TTree*)r->Get("TKR_Hits_In_Lyr_0");
> Float_t mean = tree->GetMean();
> }
> 



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