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 //  Nsubjettiness Package
 //  Questions/Comments?  jthaler@jthaler.net
 //
 //  Copyright (c) 2011-14
 //  Jesse Thaler, Ken Van Tilburg, Christopher K. Vermilion, and TJ Wilkason
 //
 //  $Id: AxesDefinition.hh 1412 2024-02-29 00:15:59Z jthaler $
 //----------------------------------------------------------------------
 // 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_AXES_DEFINITION_HH__
 #define __FASTJET_CONTRIB_AXES_DEFINITION_HH__
 
 
 #include "MeasureDefinition.hh"
 #include "ExtraRecombiners.hh"
 
 #include "fastjet/PseudoJet.hh"
 #include <fastjet/LimitedWarning.hh>
 
 #include <iomanip>
 #include <cmath>
 #include <vector>
 #include <list>
 
 FASTJET_BEGIN_NAMESPACE      // defined in fastjet/internal/base.hh
 
 namespace contrib {
    
 // The following AxesDefinitions are currently available (and the relevant arguments, if needed)
 class HalfKT_Axes;
 class KT_Axes;
 class CA_Axes;
 class AntiKT_Axes;         // (R0)
 class WTA_HalfKT_Axes;
 class WTA_KT_Axes;
 class WTA_CA_Axes;
 class GenKT_Axes;          // (p, R0 = infinity)
 class WTA_GenKT_Axes;      // (p, R0 = infinity)
 class GenET_GenKT_Axes;    // (delta, p, R0 = infinity)
 class Manual_Axes;
    
 class OnePass_HalfKT_Axes;
 class OnePass_KT_Axes;
 class OnePass_CA_Axes;
 class OnePass_AntiKT_Axes;       // (R0)
 class OnePass_WTA_HalfKT_Axes;
 class OnePass_WTA_KT_Axes;
 class OnePass_WTA_CA_Axes;
 class OnePass_GenKT_Axes;        // (p, R0 = infinity)
 class OnePass_WTA_GenKT_Axes;    // (p, R0 = infinity)
 class OnePass_GenET_GenKT_Axes;  // (delta, p, R0 = infinity)
 class OnePass_Manual_Axes;
    
 class MultiPass_Axes;            // (NPass) (currently only defined for KT_Axes)
 class MultiPass_Manual_Axes;     // (NPass)
 
 class Comb_GenKT_Axes;           // (nExtra, p, R0 = infinity)
 class Comb_WTA_GenKT_Axes;       // (nExtra, p, R0 = infinity)
 class Comb_GenET_GenKT_Axes;     // (nExtra, delta, p, R0 = infinity)
 
 ///////
 //
 // AxesDefinition
 //
 ///////
 
 ///------------------------------------------------------------------------
 /// \class AxesDefinition
 /// \brief Base class for axes definitions
 ///
 /// A generic AxesDefinition first finds a set of seed axes.
 /// Then, if desired, uses measure information
 /// (from MeasureDefinition) to refine those axes starting from those seed axes.
 /// The AxesDefinitions are typically based on sequential jet algorithms.
 ///------------------------------------------------------------------------
 class AxesDefinition {
    
 public:
    
    /// This function should be overloaded in all derived classes, and defines how to find the seed axes.
    /// If desired, the measure information (which might be NULL) can be used to test multiple axes choices, but should
    /// not be used for iterative refining (since that is the job of MeasureDefinition).
    virtual std::vector<fastjet::PseudoJet> get_starting_axes(int n_jets,
                                                              const std::vector<fastjet::PseudoJet>& inputs,
                                                              const MeasureDefinition * measure) const = 0;
    
    /// Short description of AxesDefinitions (and any parameters)
    virtual std::string short_description() const = 0;
 
    /// Long description of AxesDefinitions (and any parameters)
    virtual std::string description() const = 0;
    
    /// This has to be defined in all derived classes, and allows these to be copied around.
    virtual AxesDefinition* create() const = 0;
    
 public:
    
    /// Starting from seeds, refine axes using one or more passes.
    /// Note that in order to do >0 passes, we need information from the MeasureDefinition about how to do the appropriate minimization.
    std::vector<fastjet::PseudoJet> get_refined_axes(int n_jets,
                                                     const std::vector<fastjet::PseudoJet>& inputs,
                                                     const std::vector<fastjet::PseudoJet>& seedAxes,
                                                     const MeasureDefinition * measure = NULL) const {
 
       assert(n_jets == (int)seedAxes.size()); //added int casting to get rid of compiler warning
             
       if (_Npass == 0) {
          // no refining, just use seeds
          return seedAxes;
       } else if (_Npass == 1) {
          if (measure == NULL) throw Error("AxesDefinition:  One-pass minimization requires specifying a MeasureDefinition.");
          
          // do one pass minimum using measure definition
          return measure->get_one_pass_axes(n_jets, inputs, seedAxes,_nAttempts,_accuracy);
       } else {
          if (measure == NULL) throw Error("AxesDefinition:  Multi-pass minimization requires specifying a MeasureDefinition.");
          return get_multi_pass_axes(n_jets, inputs, seedAxes, measure);
       }
    }
    
    /// Combines get_starting_axes with get_refined_axes.
    /// In the Njettiness class, these two steps are done separately in order to store seed axes information.
    std::vector<fastjet::PseudoJet> get_axes(int n_jets,
                                             const std::vector<fastjet::PseudoJet>& inputs,
                                             const MeasureDefinition * measure = NULL) const {
       std::vector<fastjet::PseudoJet> seedAxes = get_starting_axes(n_jets, inputs, measure);
       return get_refined_axes(n_jets,inputs,seedAxes,measure);
    }
 
    
    /// Short-hand for the get_axes function.  Useful when trying to write terse code.
    inline std::vector<fastjet::PseudoJet> operator() (int n_jets,
                                                const std::vector<fastjet::PseudoJet>& inputs,
                                                const MeasureDefinition * measure = NULL) const {
       return get_axes(n_jets,inputs,measure);
    }
    
    /// \enum AxesRefiningEnum
    /// Defines the cases of zero pass and one pass for convenience
    enum AxesRefiningEnum {
       UNDEFINED_REFINE = -1, // added to create a default value
       NO_REFINING = 0,
       ONE_PASS = 1,
       MULTI_PASS = 100,
    };
    
    /// A integer that is used externally to decide how to do multi-pass minimization
    int nPass() const { return _Npass; }
 
    /// A flag that indicates whether results are deterministics.
    bool givesRandomizedResults() const {
       return (_Npass > 1);
    }
    
    /// A flag that indicates whether manual axes are being used.
    bool needsManualAxes() const {
       return _needsManualAxes; // if there is no starting axes finder
    }
    
    /// Allows user to change number of passes.  Also used internally to set nPass.
    /// Can also specify details of one/multi pass minimziation
    void setNPass(int nPass,
                  int nAttempts = 1000,
                  double accuracy  = 0.0001,
                  double noise_range = 1.0 // only needed for MultiPass minimization
                  )
    {
       _Npass = nPass;
       _nAttempts = nAttempts;
       _accuracy = accuracy;
       _noise_range = noise_range;
       if (nPass < 0) throw Error("AxesDefinition requires a nPass >= 0");
    }
    
    /// Destructor
    virtual ~AxesDefinition() {};
    
 protected:
    
    /// Default constructor contains no information.  Number of passes has to be set
    /// manually by derived classes using setNPass function.
    AxesDefinition() : _Npass(UNDEFINED_REFINE),
                      _nAttempts(0),
                      _accuracy(0.0),
                      _noise_range(0.0),
                      _needsManualAxes(false) {}
 
    /// Does multi-pass minimization by randomly jiggling the axes within _noise_range
    std::vector<fastjet::PseudoJet> get_multi_pass_axes(int n_jets,
                                                        const std::vector<fastjet::PseudoJet>& inputs,
                                                        const std::vector<fastjet::PseudoJet>& seedAxes,
                                                        const MeasureDefinition* measure) const;
    
    /// Function to jiggle axes within _noise_range
    PseudoJet jiggle(const PseudoJet& axis) const;
    
    int _Npass;            ///< Number of passes (0 = no refining, 1 = one-pass, >1 multi-pass)
    int _nAttempts;        ///< Number of attempts per pass
    double _accuracy;      ///< Accuracy goal per pass
    double _noise_range;   ///< Noise in rapidity/phi (for multi-pass minimization only)
    bool _needsManualAxes; ///< Flag to indicate special case of manual axes
 };
   
 ///------------------------------------------------------------------------
 /// \class ExclusiveJetAxes
 /// \brief Base class for axes defined from exclusive jet algorithm
 ///
 /// This class finds axes by clustering particles with an exclusive jet definition.
 /// This can be implemented with different jet algorithms.  The user can call this directly
 /// using their favorite fastjet::JetDefinition
 ///------------------------------------------------------------------------
 class ExclusiveJetAxes : public AxesDefinition {
    
 public:
    /// Constructor takes JetDefinition as an argument
    ExclusiveJetAxes(fastjet::JetDefinition def)
    : AxesDefinition(), _def(def) {
       setNPass(NO_REFINING);    // default to no minimization
    }
    
    /// Starting axes obtained by creating a cluster sequenence and running exclusive_jets.
    virtual std::vector<fastjet::PseudoJet> get_starting_axes(int n_jets,
                                                              const std::vector <fastjet::PseudoJet> & inputs,
                                                              const MeasureDefinition * ) const {
       fastjet::ClusterSequence jet_clust_seq(inputs, _def);
       
       std::vector<fastjet::PseudoJet> axes_temp = jet_clust_seq.exclusive_jets_up_to(n_jets);
       
       if ((int)axes_temp.size() < n_jets) {
          _too_few_axes_warning.warn("ExclusiveJetAxes::get_starting_axes:  Fewer than N axes found; results are unpredictable.");
          axes_temp.resize(n_jets);  // resize to make sure there are enough axes to not yield an error elsewhere
       }
      
       // Create axes list with extra information stripped (since ClusterSequence will not be kept around)
       std::vector<fastjet::PseudoJet> axes;
       axes.resize(n_jets);
       for (unsigned int i = 0; i < axes_temp.size(); i++) {
          axes[i].reset_momentum(axes_temp[i]);
       }
       
       return axes;
    }
    
    /// Short description
    virtual std::string short_description() const { return "ExclAxes";}
    /// Long description
    virtual std::string description() const { return "ExclAxes: " + _def.description();}
    
    /// To make it possible to copy around.
    virtual ExclusiveJetAxes* create() const {return new ExclusiveJetAxes(*this);}
 
 private:
    fastjet::JetDefinition _def; ///< Jet definition to use.
    static LimitedWarning _too_few_axes_warning;
 };
 
 ///------------------------------------------------------------------------
 /// \class ExclusiveCombinatorialJetAxes
 /// \brief Base class for axes defined from exclusive jet algorithm, checking combinatorial options
 ///
 /// This class finds axes by clustering particles with an exclusive jet definition.
 /// It takes an extra number of jets (specificed by the user via nExtra), and then finds the set of N that minimizes N-jettiness.
 /// WARNING: If one wants to be guarenteed that results improve by increasing nExtra, then one should use
 /// winner-take-all-style recombination schemes
 ///------------------------------------------------------------------------
 class ExclusiveCombinatorialJetAxes : public AxesDefinition {
    
 public:
    /// Constructor takes JetDefinition and nExtra as options (nExtra=0 acts the same as ExclusiveJetAxes)
    ExclusiveCombinatorialJetAxes(fastjet::JetDefinition def, int nExtra = 0)
    : AxesDefinition(), _def(def), _nExtra(nExtra) {
       if (nExtra < 0) throw Error("Need nExtra >= 0");
       setNPass(NO_REFINING);   // default to no minimization
    }
    
     /// Find n_jets + _nExtra axes, and then choose the n_jets subset with the smallest N-(sub)jettiness value.
     virtual std::vector<fastjet::PseudoJet> get_starting_axes(int n_jets, 
                                                            const std::vector<fastjet::PseudoJet> & inputs,
                                                            const MeasureDefinition *measure) const {
       int starting_number = n_jets + _nExtra;
       fastjet::ClusterSequence jet_clust_seq(inputs, _def);
       std::vector<fastjet::PseudoJet> starting_axes = jet_clust_seq.exclusive_jets_up_to(starting_number);
        
        if ((int)starting_axes.size() < n_jets) {
           _too_few_axes_warning.warn("ExclusiveCombinatorialJetAxes::get_starting_axes:  Fewer than N + nExtra axes found; results are unpredictable.");
           starting_axes.resize(n_jets);  // resize to make sure there are enough axes to not yield an error elsewhere
        }
        
       std::vector<fastjet::PseudoJet> final_axes;
 
       // check so that no computation time is wasted if there are no extra axes
       if (_nExtra == 0) final_axes = starting_axes;
 
       else {
  
         // define string of 1's based on number of desired jets
         std::string bitmask(n_jets, 1);
         // expand the array size to the total number of jets with extra 0's at the end, makes string easy to permute
         bitmask.resize(starting_number, 0); 
  
         double min_tau = std::numeric_limits<double>::max();
         std::vector<fastjet::PseudoJet> temp_axes;
          
         do {
 
           temp_axes.clear();
  
           // only take an axis if it is listed as true (1) in the string
           for (int i = 0; i < (int)starting_axes.size(); ++i) {
             if (bitmask[i]) temp_axes.push_back(starting_axes[i]);
           }
  
           double temp_tau = measure->result(inputs, temp_axes);
           if (temp_tau < min_tau) {
             min_tau = temp_tau;
             final_axes = temp_axes;
           }
  
           // permutes string of 1's and 0's according to next lexicographic ordering and returns true
           // continues to loop through all possible lexicographic orderings
           // returns false and breaks the loop when there are no more possible orderings
         } while (std::prev_permutation(bitmask.begin(), bitmask.end()));
       }
 
       return final_axes;
     }
 
    /// Short description
    virtual std::string short_description() const { return "ExclCombAxes";}
    /// Long description
    virtual std::string description() const { return "ExclCombAxes: " + _def.description();}
    /// To make it possible to copy around.
    virtual ExclusiveCombinatorialJetAxes* create() const {return new ExclusiveCombinatorialJetAxes(*this);}
 
 private:
    fastjet::JetDefinition _def;   ///< Jet definition to use
    int _nExtra;                   ///< Extra axes to find
    static LimitedWarning _too_few_axes_warning;
 };
    
 ///------------------------------------------------------------------------
 /// \class HardestJetAxes
 /// \brief Base class for axes defined from an inclusive jet algorithm
 ///
 /// This class finds axes by running an inclusive algorithm and then finding the n hardest jets.
 /// This can be implemented with different jet algorithms, and can be called by the user.
 ///------------------------------------------------------------------------
 class HardestJetAxes : public AxesDefinition {
 public:
    /// Constructor takes JetDefinition
    HardestJetAxes(fastjet::JetDefinition def)
    : AxesDefinition(), _def(def) {
       setNPass(NO_REFINING);    // default to no minimization
    }
    
    /// Finds seed axes by running a ClusterSequence, running inclusive_jets, and finding the N hardest
    virtual std::vector<fastjet::PseudoJet> get_starting_axes(int n_jets,
                                                              const std::vector <fastjet::PseudoJet> & inputs,
                                                              const MeasureDefinition * ) const {
       fastjet::ClusterSequence jet_clust_seq(inputs, _def);
       std::vector<fastjet::PseudoJet> axes = sorted_by_pt(jet_clust_seq.inclusive_jets());
       
       if ((int)axes.size() < n_jets) {
          _too_few_axes_warning.warn("HardestJetAxes::get_starting_axes:  Fewer than N axes found; results are unpredictable.");
       }
       
       axes.resize(n_jets);  // only keep n hardest
       return axes;
    }
    
    /// Short description
    virtual std::string short_description() const { return "HardAxes";}
    /// Long description
    virtual std::string description() const { return "HardAxes: " + _def.description();}
    /// To make it possible to copy around.
    virtual HardestJetAxes* create() const {return new HardestJetAxes(*this);}
    
 private:
    fastjet::JetDefinition _def;  ///< Jet Definition to use.
    
    static LimitedWarning _too_few_axes_warning;
 
 };
 
 
 ///------------------------------------------------------------------------
 /// \class HalfKT_Axes
 /// \brief Axes from exclusive generalized kT with p = 1/2
 ///
 /// Axes from a general KT algorithm with p=1/2 (standard E-scheme recombination)
 ///------------------------------------------------------------------------
 class HalfKT_Axes : public ExclusiveJetAxes {
    
 public:
    /// Constructor
   HalfKT_Axes()
    : ExclusiveJetAxes(fastjet::JetDefinition(fastjet::genkt_algorithm,
                                              fastjet::JetDefinition::max_allowable_R,
                                              0.5)) {
       setNPass(NO_REFINING);
    }
    
    /// Short description
    virtual std::string short_description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "HalfKT";
       return stream.str();
    };
    
    /// Long descriptions
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
      << "Half KT Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual HalfKT_Axes* create() const {return new HalfKT_Axes(*this);}
 
 };
 
    
 ///------------------------------------------------------------------------
 /// \class KT_Axes
 /// \brief Axes from exclusive kT
 ///
 /// Axes from kT algorithm with E_scheme recombination.
 ///------------------------------------------------------------------------
 class KT_Axes : public ExclusiveJetAxes {
 public:
    /// Constructor
    KT_Axes()
    : ExclusiveJetAxes(fastjet::JetDefinition(fastjet::kt_algorithm,
                                              fastjet::JetDefinition::max_allowable_R, //maximum jet radius constant
                                              fastjet::E_scheme,
                                              fastjet::Best)
                       ) {
       setNPass(NO_REFINING);
    }
 
    /// Short description
    virtual std::string short_description() const {
       return "KT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "KT Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual KT_Axes* create() const {return new KT_Axes(*this);}
 
 };
 
 ///------------------------------------------------------------------------
 /// \class CA_Axes
 /// \brief Axes from exclusive CA
 ///
 /// Axes from CA algorithm with E_scheme recombination.
 ///------------------------------------------------------------------------
 class CA_Axes : public ExclusiveJetAxes {
 public:
    /// Constructor
    CA_Axes()
    : ExclusiveJetAxes(fastjet::JetDefinition(fastjet::cambridge_algorithm,
                                              fastjet::JetDefinition::max_allowable_R, //maximum jet radius constant
                                              fastjet::E_scheme,
                                              fastjet::Best)
                       ) {
       setNPass(NO_REFINING);
    }
 
    /// Short description
    virtual std::string short_description() const {
       return "CA";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "CA Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual CA_Axes* create() const {return new CA_Axes(*this);}
    
 };
 
    
 ///------------------------------------------------------------------------
 /// \class AntiKT_Axes
 /// \brief Axes from inclusive anti-kT
 ///
 /// Axes from anti-kT algorithm and E_scheme.
 /// The one parameter R0 is subjet radius
 ///------------------------------------------------------------------------
 class AntiKT_Axes : public HardestJetAxes {
 
 public:
    /// Constructor.  Takes jet radius as argument
    AntiKT_Axes(double R0)
    : HardestJetAxes(fastjet::JetDefinition(fastjet::antikt_algorithm,
                                            R0,
                                            fastjet::E_scheme,
                                            fastjet::Best)
                     ), _R0(R0) {
       setNPass(NO_REFINING);
    }
 
    /// Short description
    virtual std::string short_description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "AKT" << _R0;
       return stream.str();
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "Anti-KT Axes (R0 = " << _R0 << ")";
       return stream.str();
    };
    
    /// For copying purposes
    virtual AntiKT_Axes* create() const {return new AntiKT_Axes(*this);}
    
 protected:
    double _R0;  ///<  AKT jet radius
 
 };
 
 ///------------------------------------------------------------------------
 /// \class JetDefinitionWrapper
 /// \brief Wrapper for jet definitions (for memory management)
 ///
 /// This class is used by all AxesDefinition with a manual recombiner to
 /// ensure that the delete_recombiner_when_unused function is always called
 ///------------------------------------------------------------------------
 class JetDefinitionWrapper {
 
 public: 
    
    /// Default Constructor
    JetDefinitionWrapper(JetAlgorithm jet_algorithm_in, double R_in, double xtra_param_in, const JetDefinition::Recombiner *recombiner) {
       jet_def = fastjet::JetDefinition(jet_algorithm_in, R_in, xtra_param_in);
       jet_def.set_recombiner(recombiner);
       jet_def.delete_recombiner_when_unused();        // added to prevent memory leaks
    }
 
    /// Additional constructor so that build-in FastJet algorithms can also be called
    JetDefinitionWrapper(JetAlgorithm jet_algorithm_in, double R_in, const JetDefinition::Recombiner *recombiner, fastjet::Strategy strategy_in) {
       jet_def = fastjet::JetDefinition(jet_algorithm_in, R_in, recombiner, strategy_in);
       jet_def.delete_recombiner_when_unused();
    }
 
    /// Return jet definition
    JetDefinition getJetDef() {
       return jet_def;
    }
 
 private:
    JetDefinition jet_def;  ///< my jet definition
 };
 
 ///------------------------------------------------------------------------
 /// \class WTA_HalfKT_Axes
 /// \brief Axes from exclusive generalized kT with p =1/2, winner-take-all recombination
 ///
 /// Axes from a general KT algorithm (p = 1/2) with a Winner Take All Recombiner
 ///------------------------------------------------------------------------
 class WTA_HalfKT_Axes : public ExclusiveJetAxes {
 
 public:
    /// Constructor
   WTA_HalfKT_Axes()
    : ExclusiveJetAxes(JetDefinitionWrapper(fastjet::genkt_algorithm,
                                            fastjet::JetDefinition::max_allowable_R,
                                             0.5,
                                             new WinnerTakeAllRecombiner()
                                             ).getJetDef()) {
       setNPass(NO_REFINING);
    }
 
    /// Short description
    virtual std::string short_description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "WTA, HalfKT";
       return stream.str();
    };
    
    /// Long descriptions
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "Winner-Take-All Half KT Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual WTA_HalfKT_Axes* create() const {return new WTA_HalfKT_Axes(*this);}
 
 };
 
 
 ///------------------------------------------------------------------------
 /// \class WTA_KT_Axes
 /// \brief Axes from exclusive kT, winner-take-all recombination
 ///
 /// Axes from kT algorithm and winner-take-all recombination
 ///------------------------------------------------------------------------
 class WTA_KT_Axes : public ExclusiveJetAxes {
 public:
    /// Constructor
    WTA_KT_Axes()
    : ExclusiveJetAxes(JetDefinitionWrapper(fastjet::kt_algorithm,
                                           fastjet::JetDefinition::max_allowable_R, //maximum jet radius constant
                                           new WinnerTakeAllRecombiner(), // Needs to be explicitly declared (this will be deleted by JetDefinitionWrapper)
                                           fastjet::Best).getJetDef()
                       ) {
       setNPass(NO_REFINING);
     }
 
    /// Short description
    virtual std::string short_description() const {
       return "WTA KT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "Winner-Take-All KT Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual WTA_KT_Axes* create() const {return new WTA_KT_Axes(*this);}
 
 };
    
 ///------------------------------------------------------------------------
 /// \class WTA_CA_Axes
 /// \brief Axes from exclusive CA, winner-take-all recombination
 ///
 /// Axes from CA algorithm and winner-take-all recombination
 ///------------------------------------------------------------------------
 class WTA_CA_Axes : public ExclusiveJetAxes {
 public:
    /// Constructor
    WTA_CA_Axes()
    : ExclusiveJetAxes(JetDefinitionWrapper(fastjet::cambridge_algorithm,
                                              fastjet::JetDefinition::max_allowable_R, //maximum jet radius constant
                                              new WinnerTakeAllRecombiner(), // Needs to be explicitly declared (this will be deleted by JetDefinitionWrapper)
                                              fastjet::Best).getJetDef()) {
     setNPass(NO_REFINING);
   }
 
    /// Short description
    virtual std::string short_description() const {
       return "WTA CA";
    };
    
    /// Long descriptions
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "Winner-Take-All CA Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual WTA_CA_Axes* create() const {return new WTA_CA_Axes(*this);}
   
 };
 
 
 ///------------------------------------------------------------------------
 /// \class GenKT_Axes
 /// \brief Axes from exclusive generalized kT
 ///
 /// Axes from a general KT algorithm (standard E-scheme recombination)
 /// Requires the power of the KT algorithm to be used and the radius parameter
 ///------------------------------------------------------------------------
 class GenKT_Axes : public ExclusiveJetAxes {
    
 public:
    /// Constructor
    GenKT_Axes(double p, double R0 = fastjet::JetDefinition::max_allowable_R)
    : ExclusiveJetAxes(fastjet::JetDefinition(fastjet::genkt_algorithm,
                                              R0,
                                              p)), _p(p), _R0(R0) {
       if (p < 0) throw Error("GenKT_Axes:  Currently only p >=0 is supported.");
       setNPass(NO_REFINING);
    }
    
    /// Short description
    virtual std::string short_description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "GenKT Axes";
       return stream.str();
    };
    
    /// Long descriptions
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "General KT (p = " << _p << "), R0 = " << _R0;
       return stream.str();
    };
    
    /// For copying purposes
    virtual GenKT_Axes* create() const {return new GenKT_Axes(*this);}
    
 protected:
    double _p;   ///< genkT power
    double _R0;  ///< jet radius
 };
    
    
 ///------------------------------------------------------------------------
 /// \class WTA_GenKT_Axes
 /// \brief Axes from exclusive generalized kT, winner-take-all recombination
 ///
 /// Axes from a general KT algorithm with a Winner Take All Recombiner
 /// Requires the power of the KT algorithm to be used and the radius parameter
 ///------------------------------------------------------------------------
 class WTA_GenKT_Axes : public ExclusiveJetAxes {
 
 public:
    /// Constructor
    WTA_GenKT_Axes(double p, double R0 = fastjet::JetDefinition::max_allowable_R)
    : ExclusiveJetAxes(JetDefinitionWrapper(fastjet::genkt_algorithm,
                                             R0,
                                             p,
                                             new WinnerTakeAllRecombiner()
                                             ).getJetDef()), _p(p), _R0(R0) {
       if (p < 0) throw Error("WTA_GenKT_Axes:  Currently only p >=0 is supported.");
       setNPass(NO_REFINING);
    }
 
    /// Short description
    virtual std::string short_description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "WTA, GenKT Axes";
       return stream.str();
    };
    
    /// Long descriptions
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "Winner-Take-All General KT (p = " << _p << "), R0 = " << _R0;
       return stream.str();
    };
    
    /// For copying purposes
    virtual WTA_GenKT_Axes* create() const {return new WTA_GenKT_Axes(*this);}
    
 protected:
    double _p;   ///< genkT power
    double _R0;  ///< jet radius
 };
    
 ///------------------------------------------------------------------------
 /// \class GenET_GenKT_Axes
 /// \brief Axes from exclusive kT, generalized Et-scheme recombination
 ///
 /// Class using general KT algorithm with a more general recombination scheme
 /// Requires power of KT algorithm, power of recombination weights, and radius parameter
 ///------------------------------------------------------------------------
 class GenET_GenKT_Axes : public ExclusiveJetAxes {
 
 public:
    /// Constructor
    GenET_GenKT_Axes(double delta, double p, double R0 = fastjet::JetDefinition::max_allowable_R)
    : ExclusiveJetAxes((JetDefinitionWrapper(fastjet::genkt_algorithm, R0, p, new GeneralEtSchemeRecombiner(delta))).getJetDef() ),
     _delta(delta), _p(p), _R0(R0) {
        if (p < 0) throw Error("GenET_GenKT_Axes:  Currently only p >=0 is supported.");
        if (delta <= 0) throw Error("GenET_GenKT_Axes:  Currently only delta >0 is supported.");
        setNPass(NO_REFINING);
    }
 
    /// Short description
    virtual std::string short_description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "GenET, GenKT Axes";
       return stream.str();
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2);
       // TODO: if _delta is huge, change to "WTA"
       if (_delta < std::numeric_limits<int>::max()) stream << "General Recombiner (delta = " << _delta << "), " << "General KT (p = " << _p << ") Axes, R0 = " << _R0;
       else stream << "Winner-Take-All General KT (p = " << _p << "), R0 = " << _R0;
 
       return stream.str();
    };
    
    /// For copying purposes
    virtual GenET_GenKT_Axes* create() const {return new GenET_GenKT_Axes(*this);}
    
 protected:
    double _delta; ///< Recombination pT weighting
    double _p;     ///< GenkT power
    double _R0;    ///< jet radius
 };
 
 ///------------------------------------------------------------------------
 /// \class OnePass_HalfKT_Axes
 /// \brief Axes from exclusive generalized kT (p = 1/2) with one-pass minimization
 ///
 /// Onepass minimization, General KT Axes with p = 1/2 (standard E-scheme recombination)
 ///------------------------------------------------------------------------
 class OnePass_HalfKT_Axes : public HalfKT_Axes {
    
 public:
    /// Constructor
   OnePass_HalfKT_Axes() : HalfKT_Axes() {
       setNPass(ONE_PASS);
    }
    
    /// Short description
    virtual std::string short_description() const {
       return "OnePass HalfKT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "One-Pass Minimization from Half KT Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual OnePass_HalfKT_Axes* create() const {return new OnePass_HalfKT_Axes(*this);}
 };
 
 
 ///------------------------------------------------------------------------
 /// \class OnePass_KT_Axes
 /// \brief Axes from exclusive kT, with one-pass minimization
 ///
 /// Onepass minimization from kt axes
 ///------------------------------------------------------------------------
 class OnePass_KT_Axes : public KT_Axes {
 public:
    /// Constructor
    OnePass_KT_Axes() : KT_Axes() {
       setNPass(ONE_PASS);
    }
    
    /// Short description
    virtual std::string short_description() const {
       return "OnePass KT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "One-Pass Minimization from KT Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual OnePass_KT_Axes* create() const {return new OnePass_KT_Axes(*this);}
 
 };
 
 ///------------------------------------------------------------------------
 /// \class OnePass_CA_Axes
 /// \brief Axes from exclusive CA, with one-pass minimization
 ///
 /// Onepass minimization from CA axes
 ///------------------------------------------------------------------------
 class OnePass_CA_Axes : public CA_Axes {
 public:
    /// Constructor
    OnePass_CA_Axes() : CA_Axes() {
       setNPass(ONE_PASS);
    }
 
    /// Short description
    virtual std::string short_description() const {
       return "OnePass CA";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "One-Pass Minimization from CA Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual OnePass_CA_Axes* create() const {return new OnePass_CA_Axes(*this);}
 
 
 };
    
 ///------------------------------------------------------------------------
 /// \class OnePass_AntiKT_Axes
 /// \brief Axes from inclusive anti-kT, with one-pass minimization
 ///
 /// Onepass minimization from AntiKT axes, one parameter R0
 ///------------------------------------------------------------------------
 class OnePass_AntiKT_Axes : public AntiKT_Axes {
 
 public:
    /// Constructor
    OnePass_AntiKT_Axes(double R0) : AntiKT_Axes(R0) {
       setNPass(ONE_PASS);
    }
    
    /// Short Description
    virtual std::string short_description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "OnePassAKT" << _R0;
       return stream.str();
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "One-Pass Minimization from Anti-KT Axes (R0 = " << _R0 << ")";
       return stream.str();
    };
    
    /// For copying purposes
    virtual OnePass_AntiKT_Axes* create() const {return new OnePass_AntiKT_Axes(*this);}
 
 };
 
 
 ///------------------------------------------------------------------------
 /// \class OnePass_WTA_HalfKT_Axes
 /// \brief Axes from exclusive generalized kT with p = 1/2, winner-take-all recombination, with one-pass minimization
 ///
 /// Onepass minimization from winner-take-all, General KT Axes with p = 1/2
 ///------------------------------------------------------------------------
 class OnePass_WTA_HalfKT_Axes : public WTA_HalfKT_Axes {
    
 public:
    /// Constructor
    OnePass_WTA_HalfKT_Axes() : WTA_HalfKT_Axes() {
       setNPass(ONE_PASS);
    }
 
    /// Short description
    virtual std::string short_description() const {
       return "OnePass WTA HalfKT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "One-Pass Minimization from Winner-Take-All Half KT Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual OnePass_WTA_HalfKT_Axes* create() const {return new OnePass_WTA_HalfKT_Axes(*this);}
 };
 
 ///------------------------------------------------------------------------
 /// \class OnePass_WTA_KT_Axes
 /// \brief Axes from exclusive kT, winner-take-all recombination, with one-pass minimization
 ///
 /// Onepass minimization from winner-take-all kt axes
 ///------------------------------------------------------------------------
 class OnePass_WTA_KT_Axes : public WTA_KT_Axes {
 public:
    /// Constructor
    OnePass_WTA_KT_Axes() : WTA_KT_Axes() {
       setNPass(ONE_PASS);
    }
    
    /// Short description
    virtual std::string short_description() const {
       return "OnePass WTA KT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "One-Pass Minimization from Winner-Take-All KT Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual OnePass_WTA_KT_Axes* create() const {return new OnePass_WTA_KT_Axes(*this);}
    
 
 };
 
 ///------------------------------------------------------------------------
 /// \class OnePass_WTA_CA_Axes
 /// \brief Axes from exclusive CA, winner-take-all recombination, with one-pass minimization
 ///
 /// Onepass minimization from winner-take-all CA axes
 ///------------------------------------------------------------------------
 class OnePass_WTA_CA_Axes : public WTA_CA_Axes {
    
 public:
    /// Constructor
    OnePass_WTA_CA_Axes() : WTA_CA_Axes() {
       setNPass(ONE_PASS);
    }
 
    /// Short description
    virtual std::string short_description() const {
       return "OnePass WTA CA";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "One-Pass Minimization from Winner-Take-All CA Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual OnePass_WTA_CA_Axes* create() const {return new OnePass_WTA_CA_Axes(*this);}
    
 };
 
 ///------------------------------------------------------------------------
 /// \class OnePass_GenKT_Axes
 /// \brief Axes from exclusive generalized kT with one-pass minimization
 ///
 /// Onepass minimization, General KT Axes (standard E-scheme recombination)
 ///------------------------------------------------------------------------
 class OnePass_GenKT_Axes : public GenKT_Axes {
    
 public:
    /// Constructor
    OnePass_GenKT_Axes(double p, double R0 = fastjet::JetDefinition::max_allowable_R) : GenKT_Axes(p, R0) {
       setNPass(ONE_PASS);
    }
    
    /// Short description
    virtual std::string short_description() const {
       return "OnePass GenKT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "One-Pass Minimization from General KT (p = " << _p << "), R0 = " << _R0;
       return stream.str();
    };
    
    /// For copying purposes
    virtual OnePass_GenKT_Axes* create() const {return new OnePass_GenKT_Axes(*this);}
 };
    
 ///------------------------------------------------------------------------
 /// \class OnePass_WTA_GenKT_Axes
 /// \brief Axes from exclusive generalized kT, winner-take-all recombination, with one-pass minimization
 ///
 /// Onepass minimization from winner-take-all, General KT Axes
 ///------------------------------------------------------------------------
 class OnePass_WTA_GenKT_Axes : public WTA_GenKT_Axes {
    
 public:
    /// Constructor
    OnePass_WTA_GenKT_Axes(double p, double R0 = fastjet::JetDefinition::max_allowable_R) : WTA_GenKT_Axes(p, R0) {
       setNPass(ONE_PASS);
    }
 
    /// Short description
    virtual std::string short_description() const {
       return "OnePass WTA GenKT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "One-Pass Minimization from Winner-Take-All General KT (p = " << _p << "), R0 = " << _R0;
       return stream.str();
    };
    
    /// For copying purposes
    virtual OnePass_WTA_GenKT_Axes* create() const {return new OnePass_WTA_GenKT_Axes(*this);}
 };
 
 ///------------------------------------------------------------------------
 /// \class OnePass_GenET_GenKT_Axes
 /// \brief Axes from exclusive generalized kT, generalized Et-scheme recombination, with one-pass minimization
 ///
 /// Onepass minimization from General Recomb, General KT axes
 ///------------------------------------------------------------------------
 class OnePass_GenET_GenKT_Axes : public GenET_GenKT_Axes {
    
 public:
    /// Constructor
    OnePass_GenET_GenKT_Axes(double delta, double p, double R0 = fastjet::JetDefinition::max_allowable_R) : GenET_GenKT_Axes(delta, p, R0) {
       setNPass(ONE_PASS);
    }
 
    /// Short description
    virtual std::string short_description() const {
       return "OnePass GenET, GenKT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2);
       if (_delta < std::numeric_limits<int>::max()) stream << "One-Pass Minimization from General Recombiner (delta = " 
         << _delta << "), " << "General KT (p = " << _p << ") Axes, R0 = " << _R0;
       else stream << "One-Pass Minimization from Winner-Take-All General KT (p = " << _p << "), R0 = " << _R0;
       return stream.str();
    };
    
    /// For copying purposes
    virtual OnePass_GenET_GenKT_Axes* create() const {return new OnePass_GenET_GenKT_Axes(*this);}
 };
 
 
 ///------------------------------------------------------------------------
 /// \class Manual_Axes
 /// \brief Manual axes finding
 ///
 /// Allows the user to set the axes manually
 ///------------------------------------------------------------------------
 class Manual_Axes : public AxesDefinition {
 public:
    /// Constructor.  Note that _needsManualAxes is set to true.
    Manual_Axes() : AxesDefinition() {
       setNPass(NO_REFINING);
       _needsManualAxes = true;
    }
    
    /// This is now a dummy function since this is manual mode
    virtual std::vector<fastjet::PseudoJet> get_starting_axes(int,
                                                              const std::vector<fastjet::PseudoJet>&,
                                                              const MeasureDefinition *) const;
 
    
    /// Short description
    virtual std::string short_description() const {
       return "Manual";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "Manual Axes";
       return stream.str();
    };
    
    /// For copying purposes
    virtual Manual_Axes* create() const {return new Manual_Axes(*this);}
 
 
 };
 
 ///------------------------------------------------------------------------
 /// \class OnePass_Manual_Axes
 /// \brief Manual axes finding, with one-pass minimization
 ///
 /// One pass minimization from manual starting point
 ///------------------------------------------------------------------------
 class OnePass_Manual_Axes : public Manual_Axes {
 public:
    /// Constructor.  Note that _needsManualAxes is set to true.
    OnePass_Manual_Axes() : Manual_Axes() {
       setNPass(ONE_PASS);
    }
    
    /// Short description
    virtual std::string short_description() const {
       return "OnePass Manual";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "One-Pass Minimization from Manual Axes";
       return stream.str();
    };
    
    // For copying purposes
    virtual OnePass_Manual_Axes* create() const {return new OnePass_Manual_Axes(*this);}
 
 };
    
 ///------------------------------------------------------------------------
 /// \class MultiPass_Axes
 /// \brief Manual axes finding, with multi-pass (randomized) minimization
 ///
 /// Multi-pass minimization from kT starting point
 ///------------------------------------------------------------------------
 class MultiPass_Axes : public KT_Axes {
 
 public:
    
    /// Constructor
    MultiPass_Axes(unsigned int Npass) : KT_Axes() {
       setNPass(Npass);
    }
 
    /// Short description
    virtual std::string short_description() const {
       return "MultiPass";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "Multi-Pass Axes (Npass = " << _Npass << ")";
       return stream.str();
    };
    
    /// For copying purposs
    virtual MultiPass_Axes* create() const {return new MultiPass_Axes(*this);}
    
 };
 
 ///------------------------------------------------------------------------
 /// \class MultiPass_Manual_Axes
 /// \brief Axes finding from exclusive kT, with multi-pass (randomized) minimization
 ///
 /// multi-pass minimization from kT starting point
 ///------------------------------------------------------------------------
 class MultiPass_Manual_Axes : public Manual_Axes {
 
 public:
    /// Constructor
    MultiPass_Manual_Axes(unsigned int Npass) : Manual_Axes() {
       setNPass(Npass);
    }
 
    /// Short Description
    virtual std::string short_description() const {
       return "MultiPass Manual";
    };
    
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "Multi-Pass Manual Axes (Npass = " << _Npass << ")";
       return stream.str();
    };
    
    /// For copying purposes
    virtual MultiPass_Manual_Axes* create() const {return new MultiPass_Manual_Axes(*this);}
    
 };
 
 ///------------------------------------------------------------------------
 /// \class Comb_GenKT_Axes
 /// \brief Axes from exclusive generalized kT with combinatorial testing
 ///
 /// Axes from kT algorithm (standard E-scheme recombination)
 /// Requires nExtra parameter and returns set of N that minimizes N-jettiness
 /// Note that this method is not guaranteed to find a deeper minimum than GenKT_Axes
 ///------------------------------------------------------------------------
 class Comb_GenKT_Axes : public ExclusiveCombinatorialJetAxes {
 public:
    /// Constructor
    Comb_GenKT_Axes(int nExtra, double p, double R0 = fastjet::JetDefinition::max_allowable_R)
    : ExclusiveCombinatorialJetAxes(fastjet::JetDefinition(fastjet::genkt_algorithm, R0, p), nExtra),
       _p(p), _R0(R0) {
       if (p < 0) throw Error("Comb_GenKT_Axes:  Currently only p >=0 is supported.");
       setNPass(NO_REFINING);
    }
    
    /// Short description
    virtual std::string short_description() const {
       return "N Choose M GenKT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "N Choose M Minimization (nExtra = " << _nExtra << ") from General KT (p = " << _p << "), R0 = " << _R0;
       return stream.str();
    };
    
    /// For copying purposes
    virtual Comb_GenKT_Axes* create() const {return new Comb_GenKT_Axes(*this);}
    
 private:
    double _nExtra;   ///< Number of extra axes
    double _p;        ///< GenkT power
    double _R0;       ///< jet radius
 };
    
    
 
 ///------------------------------------------------------------------------
 /// \class Comb_WTA_GenKT_Axes
 /// \brief Axes from exclusive generalized kT, winner-take-all recombination, with combinatorial testing
 ///
 /// Axes from kT algorithm and winner-take-all recombination
 /// Requires nExtra parameter and returns set of N that minimizes N-jettiness
 ///------------------------------------------------------------------------
 class Comb_WTA_GenKT_Axes : public ExclusiveCombinatorialJetAxes {
 public:
    /// Constructor
    Comb_WTA_GenKT_Axes(int nExtra, double p, double R0 = fastjet::JetDefinition::max_allowable_R)
    : ExclusiveCombinatorialJetAxes((JetDefinitionWrapper(fastjet::genkt_algorithm, R0, p, new WinnerTakeAllRecombiner())).getJetDef(), nExtra),
     _p(p), _R0(R0) {
        if (p < 0) throw Error("Comb_WTA_GenKT_Axes:  Currently only p >=0 is supported.");
        setNPass(NO_REFINING);
     }
 
    /// Short description
    virtual std::string short_description() const {
       return "N Choose M WTA GenKT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2)
       << "N Choose M Minimization (nExtra = " << _nExtra << ") from Winner-Take-All General KT (p = " << _p << "), R0 = " << _R0;
       return stream.str();
    };
    
    /// For copying purposes
    virtual Comb_WTA_GenKT_Axes* create() const {return new Comb_WTA_GenKT_Axes(*this);}
 
 private:
    double _nExtra;   ///< Number of extra axes
    double _p;        ///< GenkT power
    double _R0;       ///< jet radius
 };
    
 ///------------------------------------------------------------------------
 /// \class Comb_GenET_GenKT_Axes
 /// \brief Axes from exclusive generalized kT, generalized Et-scheme recombination, with combinatorial testing
 ///
 /// Axes from kT algorithm and General Et scheme recombination
 /// Requires nExtra parameter and returns set of N that minimizes N-jettiness
 ///------------------------------------------------------------------------
 class Comb_GenET_GenKT_Axes : public ExclusiveCombinatorialJetAxes {
 public:
    /// Constructor
    Comb_GenET_GenKT_Axes(int nExtra, double delta, double p, double R0 = fastjet::JetDefinition::max_allowable_R)
    : ExclusiveCombinatorialJetAxes((JetDefinitionWrapper(fastjet::genkt_algorithm, R0, p, new GeneralEtSchemeRecombiner(delta))).getJetDef(), nExtra),
     _delta(delta), _p(p), _R0(R0) {
        if (p < 0) throw Error("Comb_GenET_GenKT_Axes:  Currently only p >=0 is supported.");
        if (delta <= 0) throw Error("Comb_GenET_GenKT_Axes:  Currently only delta >=0 is supported.");
         setNPass(NO_REFINING);
     }
 
    /// Short description
    virtual std::string short_description() const {
       return "N Choose M GenET GenKT";
    };
    
    /// Long description
    virtual std::string description() const {
       std::stringstream stream;
       stream << std::fixed << std::setprecision(2);
       if (_delta < std::numeric_limits<int>::max()) stream << "N choose M Minimization (nExtra = " << _nExtra 
         << ") from General Recombiner (delta = " << _delta << "), " << "General KT (p = " << _p << ") Axes, R0 = " << _R0;
       else stream << "N choose M Minimization (nExtra = " << _nExtra << ") from Winner-Take-All General KT (p = " << _p << "), R0 = " << _R0;
       return stream.str();
    };
    
    /// For copying purposes
    virtual Comb_GenET_GenKT_Axes* create() const {return new Comb_GenET_GenKT_Axes(*this);}
 
 private:
    double _nExtra;   ///< Number of extra axes
    double _delta;    ///< Recombination pT weighting exponent
    double _p;        ///< GenkT power
    double _R0;       ///< jet radius
 };
    
 
 } // namespace contrib
 
 FASTJET_END_NAMESPACE
 
 #endif  // __FASTJET_CONTRIB_NJETTINESS_HH__
 

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