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06f630bb | 1 | #define tmp_cxx |
2 | #include "tmp.h" | |
3 | #include <TH2.h> | |
4 | #include <TStyle.h> | |
5 | #include <TCanvas.h> | |
6 | ||
7 | void tmp::Loop() | |
8 | { | |
9 | // In a ROOT session, you can do: | |
10 | // Root > .L tmp.C | |
11 | // Root > tmp t | |
12 | // Root > t.GetEntry(12); // Fill t data members with entry number 12 | |
13 | // Root > t.Show(); // Show values of entry 12 | |
14 | // Root > t.Show(16); // Read and show values of entry 16 | |
15 | // Root > t.Loop(); // Loop on all entries | |
16 | // | |
17 | ||
18 | // This is the loop skeleton where: | |
19 | // jentry is the global entry number in the chain | |
20 | // ientry is the entry number in the current Tree | |
21 | // Note that the argument to GetEntry must be: | |
22 | // jentry for TChain::GetEntry | |
23 | // ientry for TTree::GetEntry and TBranch::GetEntry | |
24 | // | |
25 | // To read only selected branches, Insert statements like: | |
26 | // METHOD1: | |
27 | // fChain->SetBranchStatus("*",0); // disable all branches | |
28 | // fChain->SetBranchStatus("branchname",1); // activate branchname | |
29 | // METHOD2: replace line | |
30 | // fChain->GetEntry(jentry); //read all branches | |
31 | //by b_branchname->GetEntry(ientry); //read only this branch | |
32 | if (fChain == 0) return; | |
33 | ||
34 | Long64_t nentries = fChain->GetEntriesFast(); | |
35 | ||
36 | Long64_t nbytes = 0, nb = 0; | |
37 | for (Long64_t jentry=0; jentry<nentries;jentry++) { | |
38 | Long64_t ientry = LoadTree(jentry); | |
39 | if (ientry < 0) break; | |
40 | nb = fChain->GetEntry(jentry); nbytes += nb; | |
41 | // if (Cut(ientry) < 0) continue; | |
42 | } | |
43 | } |