Hello, running the Event-example from the test subdirectory of the ROOT release, I observed that I am not able to get always the correct number of tracks in the TClonesArray via the GetEntries() function. What I did was (using root 2.23.10): root [0] .x eventload.cxx root [1] TFile f("Event.root"); root [2] TTree *T = (TTree*)f.Get("T"); root [3] Event *event = new Event(); root [4] T->SetBranchAddress("event", &event); root [5] T->GetEntry(0) root [6] event.GetTracks().GetEntries() (Int_t)594 root [7] T->GetEntry(5) root [8] event.GetTracks().GetEntries() (Int_t)610 root [9] T->GetEntry(0) root [10] event.GetTracks().GetEntries() (Int_t)610 I expected to get again 594. GetLast() and GetEntriesFast() behaved better: root [11] event.GetTracks().GetLast() (Int_t)593 root [12] event.GetTracks().GetEntriesFast() (Int_t)594 So my question is: what is the correct way to retrieve the number of entries in a TClonesArray/TObjectArray? BTW: does anybody know how to use namespaces together with the ClassDef/ClassImp macros? Goodbye, Thorsten ---------------------------------------------------- Dr. Thorsten Glebe <Thorsten.Glebe@mpi-hd.mpg.de> Max-Planck-Institut fuer Kernphysik Saupfercheckweg 1 Tel: 06221/516-631 D-69117 Heidelberg Fax: 06221/516-603 ----------------------------------------------------
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