Rene Brun writes: > > You can access the Track data interactively. That is precisely the intention > of the root/test/Event example you are quoting. > This program writes a Tree with a TClonesArray. > In an interactive session, you can then access any element of the array > with statements like: > Root > TFile f("Event.root"); > Root > T.Draw("fPx"); where fPx is a data member of the class Track > Dear Rene, I apologize for being a little bit impatient. What I mean is that given an event it doesn't seem possible to calculate an effective mass of 2 tracks or to find a track in event with highest Pt, in other words - it doesn't seem possible to get a pointer to a track defined in user's code. This is a problem. The option you mentioned - looping (inside ROOT, not inside user's code) over all the tracks - doesn't solve it. Regards, Pasha.
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