[ROOT] Copying Trees and scoping issues?

From: Alex Olivas (olivas@SLAC.stanford.edu)
Date: Mon Sep 15 2003 - 19:43:32 MEST 

i'm trying to copy entries from one tree to another.
i eventually want to make cuts, but for testing i just copy
all of the entries.  my code looks like...

TTree* uniqueTree(TChain* treeName,char* particleType);

TTree* uniqueTree(TChain* oldTree,char* particleType){
  const int nentries = (const int)oldTree->GetEntries();
 
  int upper;
  int lower;
  double UID;
  double psimass;
  if(!strcmp(particleType,"Psi2s")){
    oldTree->SetBranchAddress("upper",&upper); 
    oldTree->SetBranchAddress("lower",&lower); 
    oldTree->SetBranchAddress("psiUID",&UID); 
    oldTree->SetBranchAddress("psimass",&psimass); 
  }

  oldTree->SetBranchStatus("*",0);
  oldTree->SetBranchStatus("upper",1);
  oldTree->SetBranchStatus("lower",1);
  oldTree->SetBranchStatus("psiUID",1);
  oldTree->SetBranchStatus("psimass",1);

  TTree *newtree = oldTree->CloneTree(0);

  for (Int_t i=0;i<nentries; i++) {
    oldTree->GetEntry(i);
    newtree->Fill();
  }
  newtree->Print();
  newtree->AutoSave();
  newtree->Show(0);
  oldTree->Delete();
  return newtree;
}

i do a "Show" of the zeroth entry of the returned tree and get different 
results.

***Before TTree* is returned
======> EVENT:0
 upper           = 1227159
 lower           = -1940522577
 psimass         = 3.4278
 psiUID          = 10939

***After TTree* is returned
======> EVENT:0
 upper           = 142061856
 lower           = 1
 psimass         = 3.4278
 psiUID          = 0

any help would be greatly appreciated.
thanks,
alex.

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