physics/src/G4RDLinInterpolation.cc

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
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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 "G4RDLinInterpolation.hh"
0037
0038 // Constructor
0039
0040 G4RDLinInterpolation::G4RDLinInterpolation()
0041 { }
0042
0043 // Destructor
0044
0045 G4RDLinInterpolation::~G4RDLinInterpolation()
0046 { }
0047
0048
0049 G4RDVDataSetAlgorithm* G4RDLinInterpolation::Clone() const
0050 { return new G4RDLinInterpolation; }
0051
0052 G4double G4RDLinInterpolation::Calculate(G4double x, G4int bin,
0053                        const G4DataVector& points,
0054                        const G4DataVector& data) const
0055 {
0056   G4int nBins = data.size() - 1;
0057   G4double value = 0.;
0058   if (x < points[0])
0059     {
0060       value = 0.;
0061     }
0062   else if (bin < nBins)
0063     {
0064       G4double e1 = points[bin];
0065       G4double e2 = points[bin+1];
0066       G4double d1 = data[bin];
0067       G4double d2 = data[bin+1];
0068       value = d1 + (d2 - d1)*(x - e1)/(e2 - e1);
0069     }
0070   else
0071     {
0072       value = data[nBins];
0073     }
0074   return value;
0075 }