[ROOT] question concerning TChain

From: Alain Romeyer (alain.romeyer@umh.ac.be)
Date: Wed May 26 2004 - 14:56:50 MEST 

Dear ROOTers,

I'm trying to chain root files with the following comands (with root 3.10):

TChain MCchain("Calib Tree","Calib Tree");
const int size = 2;
TBranch* jetInfoBranch[size];

MCchain.Add(filename1);
MCchain.Add(filename2);
MCchain.Add(filename3);
MCchain.Add(filename4);
MCchain.Add(filename5);
MCchain.Add(filename6);
MCchain.Add(filename7);
MCchain.Add(filename8);
MCchain.Add(filename9);
MCchain.Add(filename10);

MCchain.SetBranchStatus("*",0);
MCchain.SetBranchStatus("bJetsBranch",1);
MCchain.SetBranchStatus("OtherJetsBranch",1);

MCchain.SetBranchAddress("bJetsBranch",&jetInfo);
MCchain.SetBranchAddress("OtherJetsBranch",&jetInfo2);

cout << "MC chain entries : " << (MCchain.GetBranch("bJetsBranch"))->GetEntries() << endl;
jetInfoBranch[0] = MCchain.GetBranch("bJetsBranch");
cout << "Jet entries : " << jetInfoBranch[0]->GetEntries() << endl;
jetInfoBranch[1] = MCchain.GetBranch("OtherJetsBranch");
cout << "Jet 2 entries : " << jetInfoBranch[1]->GetEntries() << endl;
cout << "MC chain entries : " << MCchain.GetEntries() << endl;
[/i]
Unfortunatelly the (MCchain.GetBranch("bJetsBranch"))->GetEntries() or MCchain.GetEntries() returns 0 and the jetInfoBranch[*]->GetEntries() return the number of entries of the last file...

so where is my error ?

Best regards,

Alain

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Alain Romeyer
Service de Physique des Particules Elémentaires
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B-7000 MONS Belgium               Email : alain.romeyer@umh.ac.be

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