RangeDefinition.cc

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//STARTHEADER
// $Id: RangeDefinition.cc 760 2007-06-25 16:07:05Z salam $
//
// Copyright (c) 2005-2007, Matteo Cacciari and Gavin Salam
//
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// This file is part of FastJet.
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#include "fastjet/RangeDefinition.hh"

FASTJET_BEGIN_NAMESPACE      // defined in fastjet/internal/base.hh

using namespace std;
 
void RangeDefinition::_numerical_total_area(double rapmax, int npoints) {

      int count = 0;
      double deltaphi = twopi/double(npoints);
      double deltarap = 2.0*rapmax/double(npoints);
      double phi = 0.0;
      for(int i = 0; i < npoints; i++) {
        double rap = -rapmax;
        for (int j = 0; j < npoints; j++) {
          if ( is_in_range(rap,phi) ) { count++; }
          rap += deltarap;
        }
        phi += deltaphi;
      }

      _total_area = double(count)/double(npoints*npoints)*2.0*twopi*rapmax;
}

FASTJET_END_NAMESPACE