G4LogLogInterpolator.cc

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00001 //
00002 // ********************************************************************
00003 // * License and Disclaimer                                           *
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00010 // *                                                                  *
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00017 // *                                                                  *
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00024 // ********************************************************************
00025 //
00026 //
00027 // $Id$
00028 //
00029 // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
00030 //
00031 // History:
00032 // -----------
00033 // 31 Jul 2001   MGP        Created
00034 // 31 Jul 2008   MGP        Revised and renamed to G4LogLogInterpolator
00035 //
00036 // -------------------------------------------------------------------
00037 
00038 #include "G4LogLogInterpolator.hh"
00039 
00040 // Constructor
00041 
00042 G4LogLogInterpolator::G4LogLogInterpolator()
00043 { }
00044 
00045 // Destructor
00046 
00047 G4LogLogInterpolator::~G4LogLogInterpolator()
00048 { }
00049 
00050 G4IInterpolator* G4LogLogInterpolator::Clone() const 
00051 { return new G4LogLogInterpolator; }
00052 
00053 
00054 G4double G4LogLogInterpolator::Calculate(G4double x, G4int bin, 
00055                                          const G4DataVector& points, 
00056                                          const G4DataVector& data) const
00057 {
00058   G4int nBins = data.size() - 1;
00059   // ---- MGP ---- To be verified; value = 0. is redundant here
00060   G4double value = 0.;
00061   if (x < points[0] || x == 0.)
00062     {
00063       value = 0;
00064     }
00065   else if (bin < nBins)
00066     {
00067       G4double e1 = points[bin];
00068       G4double e2 = points[bin+1];
00069       G4double d1 = data[bin];     
00070       G4double d2 = data[bin+1];
00071       
00072       if (d1 != 0. && d2 != 0.)
00073         {
00074           value = (std::log10(d1)*std::log10(e2/x) + std::log10(d2)*std::log10(x/e1)) / std::log10(e2/e1);
00075           value = std::pow(10.,value);
00076         }
00077       else
00078         {
00079           value = 0.;
00080         }
00081     }
00082   else
00083     {
00084       value = data[nBins];
00085     }
00086 
00087   return value;
00088 }

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