RE: [ROOT] to chain trees up with TChain

From: Philippe Canal (pcanal@fnal.gov)
Date: Thu Jul 24 2003 - 22:48:22 MEST

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Hi,

Check the class TChain and it's documentation.

Cheers,
Philippe

-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of tcli
Sent: Thursday, July 24, 2003 2:46 PM
To: roottalk@pcroot.cern.ch
Subject: [ROOT] to chain trees up with TChain


Dear root users,
    I have two root files (which can be loaded with TFile and TTree)
containing the same types of variables but of course different valuse.
If I want to use TChain to chain them up so that I can do calculations
by extracting the same type of variable from the two files (eg, find the
sum of a particular variable from a file and the same var from another
file), how to create such a Chain? And if I get such a chain of the two
file, can I plot histograms with the chain in the same way I do using a
single TTree file?

Thank you very much!

Lesley

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