1 | //STARTHEADER |
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2 | // $Id: ClusterSequence1GhostPassiveArea.cc 859 2012-11-28 01:49:23Z pavel $ |
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3 | // |
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4 | // Copyright (c) 2005-2011, 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 and are described in hep-ph/0512210. If you use |
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16 | // FastJet as part of work towards a scientific publication, please |
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17 | // include a citation to the FastJet paper. |
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18 | // |
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19 | // FastJet is distributed in the hope that it will be useful, |
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20 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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21 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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22 | // GNU General Public License for more details. |
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23 | // |
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24 | // You should have received a copy of the GNU General Public License |
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25 | // along with FastJet. If not, see <http://www.gnu.org/licenses/>. |
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26 | //---------------------------------------------------------------------- |
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27 | //ENDHEADER |
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28 | |
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29 | #include "fastjet/ClusterSequence1GhostPassiveArea.hh" |
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30 | |
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31 | FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh |
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32 | |
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33 | |
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34 | using namespace std; |
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35 | |
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36 | //---------------------------------------------------------------------- |
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37 | /// global routine for initialising and running a general passive area |
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38 | void ClusterSequence1GhostPassiveArea::_initialise_and_run_1GPA ( |
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39 | const JetDefinition & jet_def_in, |
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40 | const GhostedAreaSpec & area_spec, |
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41 | const bool & writeout_combinations) { |
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42 | |
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43 | bool continue_running; |
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44 | _initialise_AA(jet_def_in, area_spec, writeout_combinations, continue_running); |
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45 | if (continue_running) { |
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46 | _run_1GPA(area_spec); |
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47 | _postprocess_AA(area_spec); |
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48 | } |
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49 | } |
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50 | |
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51 | |
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52 | //---------------------------------------------------------------------- |
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53 | /// routine for running a passive area one ghost at a time. |
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54 | void ClusterSequence1GhostPassiveArea::_run_1GPA (const GhostedAreaSpec & area_spec) { |
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55 | // record the input jets as they are currently |
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56 | vector<PseudoJet> input_jets(_jets); |
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57 | |
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58 | // code for testing the unique tree |
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59 | vector<int> unique_tree; |
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60 | |
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61 | // initialise our temporary average area^2 |
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62 | valarray<double> lcl_average_area2(0.0, _average_area.size()); |
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63 | valarray<double> last_average_area(0.0, _average_area.size()); |
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64 | |
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65 | // run the clustering multiple times so as to get areas of all the jets |
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66 | for (int irepeat = 0; irepeat < area_spec.repeat(); irepeat++) { |
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67 | |
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68 | // first establish list of all ghosts |
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69 | vector<PseudoJet> all_ghosts; |
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70 | area_spec.add_ghosts(all_ghosts); |
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71 | |
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72 | // then run many subsets of ghosts (actually each subset contains just one ghost) |
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73 | for (unsigned ig = 0; ig < all_ghosts.size(); ig++) { |
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74 | vector<PseudoJet> some_ghosts; |
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75 | some_ghosts.push_back(all_ghosts[ig]); |
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76 | ClusterSequenceActiveAreaExplicitGhosts clust_seq(input_jets, jet_def(), |
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77 | some_ghosts, area_spec.actual_ghost_area()); |
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78 | |
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79 | if (irepeat == 0 && ig == 0) { |
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80 | // take the non-ghost part of the history and put into our own |
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81 | // history. |
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82 | _transfer_ghost_free_history(clust_seq); |
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83 | // get the "unique" order that will be used for transferring all areas. |
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84 | unique_tree = unique_history_order(); |
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85 | } |
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86 | |
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87 | // transfer areas from clust_seq into our object |
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88 | _transfer_areas(unique_tree, clust_seq); |
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89 | } |
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90 | // keep track of fluctuations in area |
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91 | lcl_average_area2 += (_average_area - last_average_area)* |
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92 | (_average_area - last_average_area); |
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93 | last_average_area = _average_area; |
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94 | } |
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95 | _average_area2 = lcl_average_area2; |
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96 | } |
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97 | |
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98 | |
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99 | FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh |
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100 | |
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