So I used MakeClass to create some histogram, using a root file generated from Delphes, but it keeps telling me that the variables doesn’t exist. (attached picture 1) I tried using another root file using the exact same code in a tutorial and it works perfectly fine. (attached picture 2)
Here is the code: for the delphes variable:
[code]#define Ana_cxx
#include “Ana.h”
#include <TH2.h>
#include <TStyle.h>
#include <TCanvas.h>
void Ana::Loop()
{
// In a ROOT session, you can do:
// Root > .L Ana.C
// Root > Ana 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;
//Set up code goes here
TH1* Hist = new TH1D("MUON","Histogram of muon-4vector",100,0,20);
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;
//The loop code
Hist->Fill(Photon_Size);
}
//the Wrap-up code
Hist->Draw();
}[/code]
and here is the code for the tutorial:
[code]#define Analyze_cxx
#include “Analyze.h”
#include <TH2.h>
#include <TStyle.h>
#include <TCanvas.h>
void Analyze::Loop()
{
// In a ROOT session, you can do:
// Root > .L Analyze.C
// Root > Analyze 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;
TH1 chi2Hist = new TH1D(“chi2”,“Histogram of Chi2”,100,0,20);
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;
chi2Hist->Fill(chi2);
}
chi2Hist->Draw();
}
[/code]
The error message:
root [0] .L Ana.C
root [1] Ana a
Warning in TClass::TClass: no dictionary for class LHEFEvent is available
Warning in TClass::TClass: no dictionary for class Event is available
Warning in TClass::TClass: no dictionary for class GenParticle is available
Warning in TClass::TClass: no dictionary for class SortableObject is available
Warning in TClass::TClass: no dictionary for class Track is available
Warning in TClass::TClass: no dictionary for class Tower is available
Warning in TClass::TClass: no dictionary for class Jet is available
Warning in TClass::TClass: no dictionary for class Electron is available
Warning in TClass::TClass: no dictionary for class Photon is available
Warning in TClass::TClass: no dictionary for class Muon is available
Warning in TClass::TClass: no dictionary for class MissingET is available
Warning in TClass::TClass: no dictionary for class ScalarHT is available
root [2] a.Loop()
Error: Symbol Photon_Size is not defined in current scope Ana.C:45:
*** Interpreter error recovered ***
The only thing that I know that is different is that some dictionaries seems to be missing with the delphes file.:
root [0] .L Ana.C
root [1] Ana a
Warning in TClass::TClass: no dictionary for class LHEFEvent is available
Warning in TClass::TClass: no dictionary for class Event is available
Warning in TClass::TClass: no dictionary for class GenParticle is available
Warning in TClass::TClass: no dictionary for class SortableObject is available
Warning in TClass::TClass: no dictionary for class Track is available
Warning in TClass::TClass: no dictionary for class Tower is available
Warning in TClass::TClass: no dictionary for class Jet is available
Warning in TClass::TClass: no dictionary for class Electron is available
Warning in TClass::TClass: no dictionary for class Photon is available
Warning in TClass::TClass: no dictionary for class Muon is available
Warning in TClass::TClass: no dictionary for class MissingET is available
Warning in TClass::TClass: no dictionary for class ScalarHT is available
root [2] a.Loop()
Error: Symbol Photon_Size is not defined in current scope Ana.C:45:
*** Interpreter error recovered ***
I wonder if anyone has experienced this before or know what is wrong?
Thanks in advance.
