void CaloD3PD::Loop() { // In a ROOT session, you can do: // Root > .L CaloD3PD.C // Root > CaloD3PD t // Root > t.GetEntry(12); // Fill t data members with entry number 12 // Root > t.Show(); // Show values of entry 12 // Root > t.Show(16); // Read and show values of entry 16 // Root > t.Loop(); // Loop on all entries //

// This is the loop skeleton where: // jentry is the global entry number in the chain // ientry is the entry number in the current Tree // Note that the argument to GetEntry must be: // jentry for TChain::GetEntry // ientry for TTree::GetEntry and TBranch::GetEntry // // To read only selected branches, Insert statements like: // METHOD1: // fChain->SetBranchStatus("*",0); // disable all branches // fChain->SetBranchStatus("branchname",1); // activate branchname // METHOD2: replace line // fChain->GetEntry(jentry); //read all branches //by b_branchname->GetEntry(ientry); //read only this branch if (fChain == 0) return;

Long64_t nentries = fChain->GetEntriesFast();

Long64_t nbytes = 0, nb = 0; for (Long64_t jentry=0; jentry<nentries;jentry++) { Long64_t ientry = LoadTree(jentry); if (ientry < 0) break; nb = fChain->GetEntry(jentry); nbytes += nb; // if (Cut(ientry) < 0) continue; } }