Hi Mat,
You have at least two problems in your code below. I have fixed these
two
problems.
Rene Brun
//Declare leaf types:
Double_t unFittedPhiMass;
//Book histograms..
TH1F *unfittedMassHist = new TH1F("unfittedMassHist","Phi Mass,
unfitted",100,0.98,1.06);
cout<<"Class name: "<<mainBranch->GetLeaf("Phimass")->ClassName()<<endl;
// Get pointers to the leaves we want to read out (only done once per
run)
TLeafD *FitMassLeaf =(TLeafD)*mainBranch->GetLeaf("Phimass")); //<=====
// Int_t nevent = T->GetEntries();
Int_t nevent = 10;
for (Int_t i=0;i<nevent;i++) {
T.GetEvent(i); //read complete accepted event in memory
//Get the data contents of the leaves..
unFittedPhiMass=FitMassLeaf->GetValue();
//Increment the histograms..
unfittedMassHist->Fill(unFittedPhiMass); //<=======
}
Matthew Martin wrote:
>
> Hi Guys,
> Am having serious problems reading out my leaves from an
> ntuple..the following code complains:
>
> Error: illegal type cast
> FILE:/usr/people/msmartin/work/root/rootbin/./vertex_rene.C LINE:21
>
> The whole macro is:
>
> {
> gROOT->Reset();
>
> TFile f("ufind.root");
> f.Cd("PhiFinder");
> TTree *T = (TTree*)gDirectory->Get("NTuple for new SSTTagger");
> TBranch *mainBranch = T->GetBranch("_1");
>
> //Declare leaf types:
> Double_t unFittedPhiMass;
>
> //Book histograms..
> TH1F *unfittedMassHist = new TH1F("unfittedMassHist","Phi Mass,
> unfitted",100,0.98,1.06);
>
> cout<<"Class name: "<<mainBranch->GetLeaf("Phimass")->ClassName()<<endl;
>
> // Get pointers to the leaves we want to read out (only done once per run)
> TLeafD *FitMassLeaf =new
> TLeafD((TLeafD)*(mainBranch->GetLeaf("Phimass")));
>
> // Int_t nevent = T->GetEntries();
> Int_t nevent = 10;
> for (Int_t i=0;i<nevent;i++) {
> T.GetEvent(i); //read complete accepted event in
> memory
> //Get the data contents of the leaves..
> unFittedPhiMass=FitMassLeaf->GetValue();
> //Increment the histograms..
> unfittedMassHist->Fill(*unFittedPhiMass);
> }
>
> //draw hists..
> unfittedMassHist->Draw();
>
> }
>
> If you want the root file, just ask!
>
> Cheers
>
> Mat Martin
This archive was generated by hypermail 2b29 : Tue Jan 02 2001 - 11:50:16 MET