Hi, I noticed a problem when calling the MakeClass() method for a TChain when a tree contains TClonesArray objects. Here are the command I issue: TChain reco("reco"); reco->Add("eventsr1.root"); reco->Add("eventsr2.root"); reco->MakeClass(); If I look in the output file reco.h, I see at the top: ////////////////////////////////////////////////////////// // This class has been automatically generated // (Thu Aug 22 11:49:49 2002 by ROOT version3.03/06) // from TChain reco/ ////////////////////////////////////////////////////////// #ifndef reco_h #define reco_h #include <TROOT.h> #include <TChain.h> #include <TFile.h> const Int_t kMaxvetodgt = 104; const Int_t kMaxstp = 2200; const Int_t kMaxslc = 1; const Int_t kMaxtrk = 3; const Int_t kMaxshw = 1; const Int_t kMaxevt = 2; These kMax* variables define the maximum number of entries each TClonesArray object contains. What I noticed is that these maximums seem to be valid only for the first tree added in the chain. In other words, if kMaxvetodgt is 200 for eventsr2.root/reco, it totally ignores that and puts the value for eventsr1.root/reco (since it was the first tree to be added). Is this an intended feature? It seems logical to have these kMax* values calculated over all trees added to a chain. Roy ------------------------------------------------------------------------------ Roy Lee / rlee@physics.harvard.edu / Department of Physics, Harvard University
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