RangeDefinition.cc

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00001 //STARTHEADER
00002 // $Id: RangeDefinition.cc 760 2007-06-25 16:07:05Z salam $
00003 //
00004 // Copyright (c) 2005-2007, Matteo Cacciari and Gavin Salam
00005 //
00006 //----------------------------------------------------------------------
00007 // This file is part of FastJet.
00008 //
00009 //  FastJet is free software; you can redistribute it and/or modify
00010 //  it under the terms of the GNU General Public License as published by
00011 //  the Free Software Foundation; either version 2 of the License, or
00012 //  (at your option) any later version.
00013 //
00014 //  The algorithms that underlie FastJet have required considerable
00015 //  development and are described in hep-ph/0512210. If you use
00016 //  FastJet as part of work towards a scientific publication, please
00017 //  include a citation to the FastJet paper.
00018 //
00019 //  FastJet is distributed in the hope that it will be useful,
00020 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
00021 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00022 //  GNU General Public License for more details.
00023 //
00024 //  You should have received a copy of the GNU General Public License
00025 //  along with FastJet; if not, write to the Free Software
00026 //  Foundation, Inc.:
00027 //      59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00028 //----------------------------------------------------------------------
00029 //ENDHEADER
00030 
00031 #include "fastjet/RangeDefinition.hh"
00032 
00033 FASTJET_BEGIN_NAMESPACE      // defined in fastjet/internal/base.hh
00034 
00035 using namespace std;
00036  
00039 void RangeDefinition::_numerical_total_area(double rapmax, int npoints) {
00040 
00041       int count = 0;
00042       double deltaphi = twopi/double(npoints);
00043       double deltarap = 2.0*rapmax/double(npoints);
00044       double phi = 0.0;
00045       for(int i = 0; i < npoints; i++) {
00046         double rap = -rapmax;
00047         for (int j = 0; j < npoints; j++) {
00048           if ( is_in_range(rap,phi) ) { count++; }
00049           rap += deltarap;
00050         }
00051         phi += deltaphi;
00052       }
00053 
00054       _total_area = double(count)/double(npoints*npoints)*2.0*twopi*rapmax;
00055 }
00056 
00057 FASTJET_END_NAMESPACE

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