Hi Alex,
What you do is not legal. You should not use local variables for
the branch addresses if you use the Tree outside the scope of the
function. Declare your variables upper,lower,UID,psimass as static
variables.
Rene Brun
On Mon, 15 Sep 2003, Alex Olivas wrote:
> 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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