Hello ROOTers; I tried to build a program that make a chain from this two root files tree.root (11.3 KB) tree2.root (20.1 KB) and then build a histogram entries vs pt for a specific particle pdg=21. I made this: { TFile hfile("hfile.root","recreate"); //create a root file TChain ch("tree")…

{ TChain ch("tree"); ch.Add("tree.root"); ch.Add("tree2.root"); TH1F h("h", "pt distribution pdg 21;P_{t} [MeV];Entries", 100, 0., 8.); h.SetDirectory(gROOT); // just a precaution ch.Project("h", "pow((fPx*fPx)+(fPy*fPy), 0.5)", "fPdgCode == 21"); h.DrawCopy(); TFile hfil…

[image] Wile_E_Coyote: ch.Project(“h”, “pow((fPxfPx)+(fPyfPy), 0.5)”, “fPdgCode == 21”); Can you explain this? Can i do in a similar way with for? I tried this: Float_t fPx,fPy; ch.SetBranchAddress("fPx",&fPx); //set branch address ch.SetBranchAddress("fPy",&fPy); for(Int_t…

TTree::Project TTree::Draw [image] Header files for Trees ROOT “Most recent” documentation about how to generate and use an “analysis skeleton”: TTree::MakeClass (see also “ROOT User’s Guide” → “Trees” → “Using TTree::MakeClass” ) TTree::MakeSelector (see also “ROOT…

[image] lm17n000032: Can i do in a similar way with for? I tried this: Float_t fPx,fPy; ch.SetBranchAddress("fPx",&fPx); //set branch address ch.SetBranchAddress("fPy",&fPy); for(Int_t i=0; i<=ch.GetEntries(); i++){ //h.Fill(); ??? And what about this? Is…

Transvers distribution fpdg=21

ROOT

Wile_E_Coyote August 12, 2019, 3:38pm 4

TTree::Project

TTree::Draw