| 1 | //STARTHEADER
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| 2 | // $Id: RangeDefinition.cc,v 1.1 2008-11-06 14:32:15 ovyn Exp $
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| 3 | //
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| 4 | // Copyright (c) 2005-2007, Matteo Cacciari and Gavin Salam
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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, write to the Free Software
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| 26 | // Foundation, Inc.:
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| 27 | // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 28 | //----------------------------------------------------------------------
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| 29 | //ENDHEADER
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| 30 |
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| 31 | #include "../include/fastjet/RangeDefinition.hh"
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| 32 |
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| 33 | FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh
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| 34 |
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| 35 | using namespace std;
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| 36 |
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| 37 | /// calculate, and set in _total_area, the area with a numerical test
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| 38 | /// takes a reasonable time with rapmax = 10, npoints = 100
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| 39 | void RangeDefinition::_numerical_total_area(double rapmax, int npoints) {
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| 40 |
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| 41 | int count = 0;
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| 42 | double deltaphi = twopi/double(npoints);
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| 43 | double deltarap = 2.0*rapmax/double(npoints);
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| 44 | double phi = 0.0;
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| 45 | for(int i = 0; i < npoints; i++) {
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| 46 | double rap = -rapmax;
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| 47 | for (int j = 0; j < npoints; j++) {
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| 48 | if ( is_in_range(rap,phi) ) { count++; }
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| 49 | rap += deltarap;
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| 50 | }
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| 51 | phi += deltaphi;
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| 52 | }
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| 53 |
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| 54 | _total_area = double(count)/double(npoints*npoints)*2.0*twopi*rapmax;
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| 55 | }
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| 56 |
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| 57 | FASTJET_END_NAMESPACE
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