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VariableR.hh
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VariableR.hh
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// VariableR Package
// Questions/Comments? jthaler@jthaler.net
//
// Copyright (c) 2009-2013
// David Krohn, Jesse Thaler, and Lian-Tao Wang
//
//----------------------------------------------------------------------
// This file is part of FastJet contrib.
//
// It is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2 of the License, or (at
// your option) any later version.
//
// It is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
// License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this code. If not, see <http://www.gnu.org/licenses/>.
//----------------------------------------------------------------------
#ifndef __FASTJET_CONTRIB_VARIABLER_HH__
#define __FASTJET_CONTRIB_VARIABLER_HH__
#include <fastjet/internal/base.hh>
#include "fastjet/JetDefinition.hh"
#include "fastjet/PseudoJet.hh"
#include "fastjet/ClusterSequence.hh"
#include <map>
#include <queue>
using namespace std;
FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh
namespace contrib {
////////
//
// Helper Functions and Enums
//
////////
// Store two jets and a distance measure
struct JetDistancePair{
int j1,j2;
double distance;
};
// Class for comparing JetDistancePairs
class CompareJetDistancePair {
public:
CompareJetDistancePair(){};
bool operator() (const JetDistancePair & lhs, const JetDistancePair &rhs) const {
return (lhs.distance > rhs.distance);
}
};
// Type of clustering
enum VRClustType {
CALIKE,
KTLIKE,
AKTLIKE
};
////////
//
// Core VR Code
//
////////
// TODO: Need to document this class
class VR : public JetDefinition::Plugin {
private:
double _rho2, _min_r2, _max_r2;
VRClustType _clust_type;
bool _precluster;
JetDefinition _pre_jet_def;
void Precluster(ClusterSequence & cs, set<int>& unmerged_jets) const;
void MergeJetWithBeam(ClusterSequence & clust_seq, JetDistancePair & jdp, set<int>& unmerged_jets) const;
void MergeJets(ClusterSequence & clust_seq,
JetDistancePair & jdp,
priority_queue< JetDistancePair, vector<JetDistancePair>, CompareJetDistancePair > &jet_queue,
set<int>& unmerged_jets) const;
inline double GetJJDistanceMeasure(const PseudoJet& j1, const PseudoJet& j2) const;
inline double GetJBDistanceMeasure(const PseudoJet& jet) const;
void SetupDistanceMeasures(ClusterSequence & clust_seq,
vector<JetDistancePair> &jet_vec,
set<int>& unmerged_jets) const;
public:
VR(double rho, double min_r, double max_r, VRClustType clust_type, bool precluster = false);
void run_clustering(fastjet::ClusterSequence & cs) const;
virtual string description() const;
virtual double R() const;
};
////////
//
// For backwards compatibility, keep old constructors
//
////////
class AKTVR : public VR {
public:
AKTVR (double rho, double max_r) : VR(rho,0.0,max_r,AKTLIKE) {}
};
class CAVR : public VR {
public:
CAVR (double rho, double max_r) : VR(rho,0.0,max_r,CALIKE) {}
};
class KTVR : public VR {
public:
KTVR (double rho, double max_r) : VR(rho,0.0,max_r,KTLIKE) {}
};
} // namespace contrib
FASTJET_END_NAMESPACE
#endif // __FASTJET_CONTRIB_VARIABLER_HH__

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