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Question Ntuple number of entries are same as primary 

Forum: Analysis
Date: 15 Jun, 2018
From: David Sangcheol Lee <David Sangcheol Lee>

Dear Geant4 experts

I need your help. I am thinking this problem is coming from the TNtuple problem so I am posting in here.

I created several classes to collect the results and store in ROOT file format. Hence, I used analysismanager.

The problem is when I plot the histogram (e.g Neutron energy spectra) from Ntuple, the number of entries shown in the root is exactly same as the number of protons that I set (i.e. 500000).

I used the same setup to create ASCII file and this works well I have more than 500000. However, when I try to store the data in ROOT file format, it is fixed at 500000.

Following lines are the lines I put in for filling the ntuple

  //fill histograms


  //fill 1st ntuples = Captureneutrons
  analysisManager->FillNtupleFColumn(0,0,fCapEnergy); // ID=0
  analysisManager->FillNtupleDColumn(0,1,fCapPosX); // ID=1
  analysisManager->FillNtupleDColumn(0,2,fCapPosY); // ID=2
  analysisManager->FillNtupleDColumn(0,3,fCapPosZ); // ID=3

  //fill 2nd ntuples = direction of neutron from the target
  analysisManager->FillNtupleFColumn(1,0,fDirEnergy); // ID=0
  analysisManager->FillNtupleFColumn(1,1,fDirAngle); // ID=1

  //fill 3rd nutple = first interaction
  analysisManager->FillNtupleFColumn(2,0,fNAngle); // ID=0
  analysisManager->FillNtupleDColumn(2,1,fNPosX); // ID=1
  analysisManager->FillNtupleDColumn(2,2,fNPosY); //ID=2
  analysisManager->FillNtupleDColumn(2,3,fNPosZ); //ID=3
  analysisManager->FillNtupleFColumn(2,4,fNEnergy); //ID=4

All these are stored in one file called totalN.root

I do not understand why I get the same number of neutrons as the number of particles I run with.

Could anyone tell me why it is happening like this and how to fix this?

I really appreciate all your help.


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1 None: Re: Ntuple number of entries are same as primary   (Ivana Hrivnacova - 19 Jun, 2018)
(_ More: Re: Ntuple number of entries are same as primary   (David Sangcheol Lee - 19 Jun, 2018)
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