G4LogLogInterpolator.cc

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//
// $Id$
//
// Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
//
// History:
// -----------
// 31 Jul 2001   MGP        Created
// 31 Jul 2008   MGP        Revised and renamed to G4LogLogInterpolator
//
// -------------------------------------------------------------------
 
#include "G4LogLogInterpolator.hh"
 
// Constructor
 
G4LogLogInterpolator::G4LogLogInterpolator()
{ }
 
// Destructor
 
G4LogLogInterpolator::~G4LogLogInterpolator()
{ }
 
G4IInterpolator* G4LogLogInterpolator::Clone() const 
{ return new G4LogLogInterpolator; }
 
 
G4double G4LogLogInterpolator::Calculate(G4double x, G4int bin, 
                     const G4DataVector& points, 
                     const G4DataVector& data) const
{
  G4int nBins = data.size() - 1;
  // ---- MGP ---- To be verified; value = 0. is redundant here
  G4double value = 0.;
  if (x < points[0] || x == 0.)
    {
      value = 0;
    }
  else if (bin < nBins)
    {
      G4double e1 = points[bin];
      G4double e2 = points[bin+1];
      G4double d1 = data[bin];     
      G4double d2 = data[bin+1];
      
      if (d1 != 0. && d2 != 0.)
    {
      value = (std::log10(d1)*std::log10(e2/x) + std::log10(d2)*std::log10(x/e1)) / std::log10(e2/e1);
      value = std::pow(10.,value);
    }
      else
    {
      value = 0.;
    }
    }
  else
    {
      value = data[nBins];
    }
 
  return value;
}