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Number of entries in TTree [message #12198] Tue, 05 July 2011 13:19 Go to previous message
Dima Melnychuk is currently offline  Dima Melnychuk
Messages: 213
Registered: April 2004
Location: National Centre for Nucle...
first-grade participant
From: *fuw.edu.pl
Dear colleagues,

I have observed a strangeness with number of entries in TTree for simulation, digitization, reconstruction and pid, i.e. these number are different and I expect them to be equal.

I do simulation with eta_c macros from /macro/run/tdrct/eta_c.
With 2000 events simulation with trunk rev.12565

Running simple macro on produced data

void test_data()
{
	TString inSimFileName = "evt_points_stt.root";
	TString inDigiFileName = "evt_digi_stt.root";
	TString inRecoFileName = "evt_reco_stt.root";
	TString inPidFileName  = "evt_pid_stt.root";
	
	TFile *inSimFile = TFile::Open(inSimFileName,"READ");
	TTree *treeSim=(TTree *) inSimFile->Get("cbmsim");

	TFile *inDigiFile = TFile::Open(inDigiFileName,"READ");
	TTree *treeDigi=(TTree *) inDigiFile->Get("cbmsim");

	TFile *inRecoFile = TFile::Open(inRecoFileName,"READ");
	TTree *treeReco=(TTree *) inRecoFile->Get("cbmsim");

	TFile *inPidFile = TFile::Open(inPidFileName,"READ");
	TTree *treePid=(TTree *) inPidFile->Get("cbmsim");

	std::cout<<"treeSim->GetEntriesFast()="<<treeSim->GetEntriesFast()<<std::endl;
	std::cout<<"treeDigi->GetEntriesFast()="<<treeDigi->GetEntriesFast()<<std::endl;
	std::cout<<"treeReco->GetEntriesFast()="<<treeReco->GetEntriesFast()<<std::endl;
	std::cout<<"treePid->GetEntriesFast()="<<treePid->GetEntriesFast()<<std::endl;
}


I have the following output
treeSim->GetEntriesFast()=2000
treeDigi->GetEntriesFast()=2001
treeReco->GetEntriesFast()=2002
treePid->GetEntriesFast()=2001


And those number are the same for stt and tpc simulation.

Should those numbers be equal?

Dima

 
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