[ROOT] Problem with CloneTree

From: Eric Thomas (ethomas@cppm.in2p3.fr)
Date: Mon Sep 01 2003 - 19:13:08 MEST


Hi,

I create a CloneTree  with the code below (no selection applied) .
It seems OK, a new tree is created with the same number of entries
as the original file. However, when I re-run the code on the produced CloneTree,
the code crash after 18 events with following error message:


This file contains 2530 events

event number 0
...
event number 18
Error: C++ exception caught FILE:/tmp/7vWjCb_cint LINE:1
*** Interpreter error recovered ***

I hardly can understand this, since I am running the same code on
(supposed) identical Trees.

I am  running root 3.05  under fermi-linux 7.

Thanks for help!


Eric


// Code extract
 if (fChain == 0) return;

  // Tree of selected events
   TFile *sel_file = new TFile("sel_tree.root","RECREATE");
   sel_file->cd();
   TTree *sel_tree = fChain->CloneTree(0);

   Int_t my_entries = Int_t(fChain->GetEntries());
   cout << endl << endl << " This file contains " << my_entries << " events " << endl << endl;

   Int_t nbytes = 0, nb = 0;

  for (Int_t jentry=0; jentry<my_entries;jentry++) {
    Int_t ientry = LoadTree(jentry);
    cout << "event number " << jentry<< endl;
    nb = fChain->GetEntry(jentry);   nbytes += nb;
    sel_tree->Fill();

 }// jentry

   sel_file->cd();
   sel_file->Write();
   sel_file->Close();

   delete sel_file;



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