yes, it is possible to append new entries to a Tree. Do: TFile *f = new TFile("myfile.root","update"); TTree *T = (TTree*)f->Get("mytree"); T->SetBranchAddress(....) //one for each top level branch loop on T->Fill(); T->Write(); Rene Brun Balint Radics wrote: > > Hello, > > My question is: Is it possible to append new data columns to an TNtuple > after I wrote it to a root file? I mean I would "UPDATE" the root file and > add a plus column to my existing ntuple. Is this possible? How? > > Thanx, > > Balint
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