Re: Root Tuples with variable dimension of Arrays.

See example in tutorial tree2.C

Rene Brun

On Tue, 7 Jun 2005, Ahsan, Mahsana wrote:

> Hello Rooter;
>
>
> Please find below my short example for creating root tuples. I am having a problem in getting right informtion when I fill the tree. Only the first leaf
> "njets" is OK while all others are quite corrupted. Can somebody please
> point me out what I am doing wrong. I want to get tuples as
>
> "tree->branch1->leaves
> ->branch2->leaves
> ->branch3->leaves
> ....."
>
> However the "tree->leaves" works even with variable dimension of array.
> The root version is 4.00/04.
> -----------------------------------------------------------------------
> struct Jet{
>
> int njets;
> float eta[10];
> float phi[10];
> float e[10];
> float pt[10];
> }
>
> Jet jet;
> TFile *hfile = new TFile("example.root","RECREATE","TTree root file");
> hfile->SetCompressionLevel(1);
> TTree *mytree = new TTree("mytree","Reconst tuple");
>
> mytree->Branch("jet",&jet.njets,"njets/I:ntracks[njets]/I:eta[njets]/F:phi[njets]/F:e[njets]/F");
>
> int nentries = 500;
> TCloneArray fJets;
>
> for(int ii=0;ii<nentries;ii++){
>
> for(int ijet=0;ijet<fJets->GetLast()+1;ijet++){
> jet.njets = ijet;
> jet.pt[ijet] = cj->Pt();
> jet.eta[ijet] = cj->Eta();
> jet.phi[ijet] = cj->Phi();
> jet.e[ijet] = cj->E();
>
> }
> mytree->Fill();
>
> }
> --------------------------------------------------------------------------
>
> Thank you very much for help,
> Mahsana
>
Received on Tue Jun 07 2005 - 21:51:16 MEST