G4LogLogInterpolator.cc

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//
// $Id: G4LogLogInterpolator.cc 70904 2013-06-07 10:34:25Z gcosmo $
//
// 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;
}