physics/src/G4RDSemiLogInterpolation.cc

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
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0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
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0022 // * use  in  resulting  scientific  publications,  and indicate your *
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0024 // ********************************************************************
0025 //
0026 //
0027 //
0028 // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
0029 //
0030 // History:
0031 // -----------
0032 // 31 Jul 2001   MGP        Created
0033 //
0034 // -------------------------------------------------------------------
0035
0036 #include "G4RDSemiLogInterpolation.hh"
0037
0038 // Constructor
0039
0040 G4RDSemiLogInterpolation::G4RDSemiLogInterpolation()
0041 { }
0042
0043
0044 // Destructor
0045
0046 G4RDSemiLogInterpolation::~G4RDSemiLogInterpolation()
0047 { }
0048
0049 G4RDVDataSetAlgorithm* G4RDSemiLogInterpolation::Clone() const
0050 { return new G4RDSemiLogInterpolation; }
0051
0052
0053 G4double G4RDSemiLogInterpolation::Calculate(G4double x, G4int bin,
0054                       const G4DataVector& points,
0055                       const G4DataVector& data) const
0056 {
0057   G4int nBins = data.size() - 1;
0058   G4double value = 0.;
0059   if (x < points[0])
0060     {
0061       value = 0.;
0062     }
0063   else if (bin < nBins)
0064     {
0065       G4double e1 = points[bin];
0066       G4double e2 = points[bin+1];
0067       G4double d1 = data[bin];
0068       G4double d2 = data[bin+1];
0069       value = (d1*std::log10(e2/x) + d2*std::log10(x/e1)) / std::log10(e2/e1);
0070     }
0071   else
0072     {
0073       value = data[nBins];
0074     }
0075   return value;
0076 }