| 1 | //FJSTARTHEADER
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| 2 | // $Id: GhostedAreaSpec.hh 3433 2014-07-23 08:17:03Z salam $
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| 3 | //
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| 4 | // Copyright (c) 2005-2014, Matteo Cacciari, Gavin P. Salam and Gregory Soyez
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| 5 | //
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| 6 | //----------------------------------------------------------------------
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| 7 | // This file is part of FastJet.
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| 8 | //
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| 9 | // FastJet is free software; you can redistribute it and/or modify
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| 10 | // it under the terms of the GNU General Public License as published by
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| 11 | // the Free Software Foundation; either version 2 of the License, or
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| 12 | // (at your option) any later version.
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| 13 | //
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| 14 | // The algorithms that underlie FastJet have required considerable
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| 15 | // development. They are described in the original FastJet paper,
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| 16 | // hep-ph/0512210 and in the manual, arXiv:1111.6097. If you use
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| 17 | // FastJet as part of work towards a scientific publication, please
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| 18 | // quote the version you use and include a citation to the manual and
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| 19 | // optionally also to hep-ph/0512210.
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| 20 | //
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| 21 | // FastJet is distributed in the hope that it will be useful,
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| 22 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 23 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 24 | // GNU General Public License for more details.
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| 25 | //
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| 26 | // You should have received a copy of the GNU General Public License
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| 27 | // along with FastJet. If not, see <http://www.gnu.org/licenses/>.
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| 28 | //----------------------------------------------------------------------
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| 29 | //FJENDHEADER
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| 30 |
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| 31 |
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| 32 | #ifndef __FASTJET_GHOSTEDAREASPEC_HH__
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| 33 | #define __FASTJET_GHOSTEDAREASPEC_HH__
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| 34 |
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| 35 | #include<vector>
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| 36 | #include<string>
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| 37 | #include "fastjet/PseudoJet.hh"
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| 38 | #include "fastjet/internal/BasicRandom.hh"
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| 39 | #include "fastjet/Selector.hh"
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| 40 | #include "fastjet/LimitedWarning.hh"
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| 41 |
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| 42 | //
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| 43 | #define STATIC_GENERATOR 1
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| 44 |
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| 45 | FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh
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| 46 |
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| 47 | /// namespace to hold default parameters for the active area spec
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| 48 | namespace gas {
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| 49 | const double def_ghost_maxrap = 6.0;
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| 50 | const int def_repeat = 1;
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| 51 | const double def_ghost_area = 0.01;
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| 52 | const double def_grid_scatter = 1.0;
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| 53 | const double def_pt_scatter = 0.1;
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| 54 | const double def_mean_ghost_pt = 1e-100;
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| 55 | }
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| 56 |
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| 57 | //----------------------------------------------------------------------
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| 58 | /// @ingroup area_classes
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| 59 | /// \class GhostedAreaSpec
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| 60 | /// Parameters to configure the computation of jet areas using ghosts
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| 61 | ///
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| 62 | /// Class that defines the parameters that go into the measurement
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| 63 | /// of active jet areas.
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| 64 | class GhostedAreaSpec {
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| 65 | public:
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| 66 | /// default constructor
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| 67 | GhostedAreaSpec(): _ghost_maxrap (gas::def_ghost_maxrap),
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| 68 | _ghost_rap_offset(0.0),
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| 69 | _repeat (gas::def_repeat),
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| 70 | _ghost_area (gas::def_ghost_area),
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| 71 | _grid_scatter (gas::def_grid_scatter),
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| 72 | _pt_scatter (gas::def_pt_scatter),
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| 73 | _mean_ghost_pt(gas::def_mean_ghost_pt),
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| 74 | _fj2_placement(false) {_initialize();}
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| 75 |
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| 76 | /// explicit constructor
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| 77 | explicit GhostedAreaSpec(double ghost_maxrap_in,
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| 78 | int repeat_in = gas::def_repeat,
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| 79 | double ghost_area_in = gas::def_ghost_area,
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| 80 | double grid_scatter_in = gas::def_grid_scatter,
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| 81 | double pt_scatter_in = gas::def_pt_scatter,
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| 82 | double mean_ghost_pt_in = gas::def_mean_ghost_pt
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| 83 | ):
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| 84 | _ghost_maxrap(ghost_maxrap_in),
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| 85 | _ghost_rap_offset(0.0),
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| 86 | _repeat(repeat_in),
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| 87 | _ghost_area(ghost_area_in),
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| 88 | _grid_scatter(grid_scatter_in),
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| 89 | _pt_scatter(pt_scatter_in),
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| 90 | _mean_ghost_pt(mean_ghost_pt_in),
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| 91 | _fj2_placement(false) {_initialize();}
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| 92 |
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| 93 | /// explicit constructor
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| 94 | explicit GhostedAreaSpec(double ghost_minrap_in,
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| 95 | double ghost_maxrap_in,
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| 96 | int repeat_in = gas::def_repeat,
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| 97 | double ghost_area_in = gas::def_ghost_area,
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| 98 | double grid_scatter_in = gas::def_grid_scatter,
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| 99 | double pt_scatter_in = gas::def_pt_scatter,
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| 100 | double mean_ghost_pt_in = gas::def_mean_ghost_pt
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| 101 | ):
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| 102 | _ghost_maxrap (0.5*(ghost_maxrap_in - ghost_minrap_in)),
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| 103 | _ghost_rap_offset(0.5*(ghost_maxrap_in + ghost_minrap_in)),
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| 104 | _repeat(repeat_in),
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| 105 | _ghost_area(ghost_area_in),
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| 106 | _grid_scatter(grid_scatter_in),
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| 107 | _pt_scatter(pt_scatter_in),
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| 108 | _mean_ghost_pt(mean_ghost_pt_in),
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| 109 | _fj2_placement(false) {_initialize();}
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| 110 |
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| 111 |
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| 112 | /// constructor based on a Selector
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| 113 | explicit GhostedAreaSpec(const Selector & selector,
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| 114 | int repeat_in = gas::def_repeat,
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| 115 | double ghost_area_in = gas::def_ghost_area,
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| 116 | double grid_scatter_in = gas::def_grid_scatter,
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| 117 | double pt_scatter_in = gas::def_pt_scatter,
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| 118 | double mean_ghost_pt_in = gas::def_mean_ghost_pt
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| 119 | );
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| 120 |
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| 121 |
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| 122 | /// does the initialization of actual ghost parameters
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| 123 | void _initialize();
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| 124 |
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| 125 | // for accessing values set by the user
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| 126 | inline double ghost_rapmax () const {return _ghost_maxrap;}
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| 127 | inline double ghost_maxrap () const {return _ghost_maxrap;}
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| 128 | inline double ghost_etamax () const {return _ghost_maxrap;}
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| 129 | inline double ghost_maxeta () const {return _ghost_maxrap;}
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| 130 | inline double ghost_area () const {return _ghost_area ;}
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| 131 | inline double grid_scatter () const {return _grid_scatter;}
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| 132 | inline double pt_scatter () const {return _pt_scatter ;}
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| 133 | inline double mean_ghost_pt() const {return _mean_ghost_pt ;}
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| 134 | inline int repeat () const {return _repeat ;}
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| 135 | inline bool fj2_placement() const {return _fj2_placement;}
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| 136 |
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| 137 | inline double kt_scatter () const {return _pt_scatter ;}
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| 138 | inline double mean_ghost_kt() const {return _mean_ghost_pt ;}
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| 139 |
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| 140 | // for accessing values
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| 141 | inline double actual_ghost_area() const {return _actual_ghost_area;}
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| 142 | inline int n_ghosts() const {return _n_ghosts;}
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| 143 |
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| 144 | // when explicitly modifying values, sometimes call the initializer
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| 145 | inline void set_ghost_area (double val) {_ghost_area = val; _initialize();}
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| 146 | inline void set_ghost_rapmax (double val) {_ghost_maxrap = val; _initialize();}
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| 147 | inline void set_ghost_maxrap (double val) {_ghost_maxrap = val; _initialize();}
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| 148 | inline void set_ghost_etamax (double val) {_ghost_maxrap = val; _initialize();}
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| 149 | inline void set_ghost_maxeta (double val) {_ghost_maxrap = val; _initialize();}
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| 150 | inline void set_grid_scatter (double val) {_grid_scatter = val; }
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| 151 | inline void set_pt_scatter (double val) {_pt_scatter = val; }
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| 152 | inline void set_mean_ghost_pt(double val) {_mean_ghost_pt = val; }
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| 153 | inline void set_repeat (int val) {_repeat = val; }
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| 154 |
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| 155 | inline void set_kt_scatter (double val) {_pt_scatter = val; }
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| 156 | inline void set_mean_ghost_kt(double val) {_mean_ghost_pt = val; }
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| 157 |
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| 158 | /// if val is true, set ghost placement as it was in FastJet 2.X. The
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| 159 | /// main differences between FJ2 and FJ3 ghost placement are
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| 160 | ///
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| 161 | /// - in FJ2 the rapidity spacing was
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| 162 | /// ceil((maxrap-minrap)/sqrt(area)), while in FJ3 it is
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| 163 | /// int((maxrap-minrap)/sqrt(area) + 0.5) [similarly for phi].
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| 164 | /// The FJ3 option offers more stability when trying to specify a
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| 165 | /// spacing that exactly fits the extent.
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| 166 | ///
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| 167 | /// - in FJ2, the ghosts are placed at the corners of grid cells
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| 168 | /// (i.e. extending up to maxrap), while in FJ3 they are placed at
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| 169 | /// the centres of grid cells (i.e. extending roughly up to
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| 170 | /// maxrap-sqrt(area)). The FJ2 behaviour effectively skews the
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| 171 | /// total area coverage when maxrap is small, by an amount
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| 172 | /// sqrt(area)/(2*maxrap).
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| 173 | ///
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| 174 | /// FJ2 placement is now deprecated.
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| 175 | void set_fj2_placement(bool val);
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| 176 |
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| 177 | /// return nphi (ghosts layed out (-nrap, 0..nphi-1), (-nrap+1,0..nphi-1),
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| 178 | /// ... (nrap,0..nphi-1)
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| 179 | inline int nphi() const {return _nphi;}
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| 180 | inline int nrap() const {return _nrap;}
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| 181 |
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| 182 | /// get all relevant information about the status of the
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| 183 | /// random number generator, so that it can be reset subsequently
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| 184 | /// with set_random_status.
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| 185 | inline void get_random_status(std::vector<int> & __iseed) const {
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| 186 | _random_generator.get_status(__iseed);}
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| 187 |
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| 188 | /// set the status of the random number generator, as obtained
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| 189 | /// previously with get_random_status. Note that the random
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| 190 | /// generator is a static member of the class, i.e. common to all
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| 191 | /// instances of the class --- so if you modify the random for this
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| 192 | /// instance, you modify it for all instances.
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| 193 | inline void set_random_status(const std::vector<int> & __iseed) {
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| 194 | _random_generator.set_status(__iseed);}
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| 195 |
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| 196 | inline void checkpoint_random() {get_random_status(_random_checkpoint);}
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| 197 | inline void restore_checkpoint_random() {set_random_status(_random_checkpoint);}
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| 198 |
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| 199 | /// for a summary
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| 200 | std::string description() const;
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| 201 |
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| 202 | /// push a set of ghost 4-momenta onto the back of the vector of
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| 203 | /// PseudoJets
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| 204 | void add_ghosts(std::vector<PseudoJet> & ) const;
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| 205 |
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| 206 | /// very deprecated public access to a random number
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| 207 | /// from the internal generator
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| 208 | inline double random_at_own_risk() const {return _our_rand();}
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| 209 | /// very deprecated public access to the generator itself
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| 210 | inline BasicRandom<double> & generator_at_own_risk() const {
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| 211 | return _random_generator;}
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| 212 |
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| 213 | private:
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| 214 |
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| 215 | // quantities that determine nature and distribution of ghosts
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| 216 | double _ghost_maxrap;
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| 217 | double _ghost_rap_offset;
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| 218 | int _repeat ;
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| 219 | double _ghost_area ;
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| 220 | double _grid_scatter;
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| 221 | double _pt_scatter ;
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| 222 | double _mean_ghost_pt;
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| 223 | bool _fj2_placement;
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| 224 |
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| 225 | Selector _selector;
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| 226 |
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| 227 | // derived quantities
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| 228 | double _actual_ghost_area, _dphi, _drap;
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| 229 | int _n_ghosts, _nphi, _nrap;
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| 230 |
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| 231 |
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| 232 | std::vector<int> _random_checkpoint;
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| 233 | static BasicRandom<double> _random_generator;
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| 234 | //mutable BasicRandom<double> _random_generator;
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| 235 |
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| 236 | static LimitedWarning _warn_fj2_placement_deprecated;
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| 237 |
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| 238 | inline double _our_rand() const {return _random_generator();}
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| 239 |
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| 240 | };
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| 241 |
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| 242 | /// just provide a typedef for backwards compatibility with programs
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| 243 | /// based on versions 2.0 and 2.1 of fastjet. Since there is no
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| 244 | /// easy way of telling people this is deprecated at compile or run
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| 245 | /// time, we should be careful before removing this in the future.
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| 246 | typedef GhostedAreaSpec ActiveAreaSpec;
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| 247 |
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| 248 |
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| 249 | FASTJET_END_NAMESPACE
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| 250 |
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| 251 | #endif // __FASTJET_GHOSTEDAREASPEC_HH__
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