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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