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treeSkimmer.C
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treeSkimmer.C
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// Tree skimmer originally written by Dinko Ferencek and altered by Steven Kaplan
// Takes as input a root tree produced with the RecoBTag/TagVarExtractor package
// Outputs a root tree with the same content where each entry is either b, c, or light (specified at runtime)
#include <iostream>
#include "TTree.h"
#include "TFile.h"
#include "TRFIOFile.h"
#include "TLeaf.h"
#include "TBranch.h"
#include <fstream>
#include <string>
#include <map>
#include <math.h>
#include "TChain.h"
using namespace std;
bool keepJet(float _jetFlavour, const string& flavCut){
if (flavCut == "b") return ( abs(_jetFlavour) == 5 );
else if (flavCut == "c") return ( abs(_jetFlavour) == 4 );
else if (flavCut == "l") return ( abs(_jetFlavour) != 5 && abs(_jetFlavour) != 4 );
}
int skim(const string& infile, const string& outname, const string& flavCut, Int_t nevts = -1){
if (flavCut != "b" && flavCut != "c" && flavCut != "l"){
cout << "flavor cut must be either b, c, or l" << endl;
return 1;
}
if (nevts >0)
cout << "Only considering the first " << nevts << " events!" << endl;
TFile *oldfile = TFile::Open(infile.c_str());
TTree *oldtree = (TTree*)oldfile->Get("tagVars/ttree");
if(oldtree){
cout << "Filtering file: " << infile << endl;
cout << "Cut to be made: " << flavCut << endl;
}
else {
cout << "File has no TTree: " << endl;
return 0;
}
TFile *outfile = new TFile(outname.c_str(),"RECREATE","ROOT file with histograms");
outfile->Close();
outfile = new TFile(outname.c_str(),"UPDATE","ROOT file with histograms");
TTree *newtree = oldtree->CloneTree(0);
Int_t nentries = (Int_t)oldtree->GetEntries();
float _jetFlavour;
Int_t nEvents = 0;
oldtree->SetBranchAddress("Jet_flavour",&_jetFlavour);
for (Int_t i=0; i<nentries; i++){
if (nEvents > nevts && nevts > 0) break;
if (i%10000 == 0) printf ("Inspecting Entry %d\n", i);
oldtree->GetEntry(i);
if ( keepJet(_jetFlavour,flavCut) ) newtree->Fill();
nEvents++;
}
newtree->AutoSave();
delete outfile;
delete oldfile;
return 0;
}