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This commit is contained in:
Gabriele Cosmo
2016-06-09 16:15:05 +02:00
parent b79225fb37
commit 74cad5e589
3877 changed files with 234205 additions and 167127 deletions
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source/processes/electromagnetic/lowenergy/src/G4LinInterpolation.cc
+47 -2
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@@ -24,14 +24,16 @@
// ********************************************************************
//
//
// $Id: G4LinInterpolation.cc,v 1.3 2006/06/29 19:40:03 gunter Exp $
// GEANT4 tag $Name: geant4-09-02 $
// $Id: G4LinInterpolation.cc,v 1.5 2009/09/25 07:41:34 sincerti Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
//
// History:
// -----------
// 31 Jul 2001 MGP Created
// 14 JUn 2009 NAK New Calculation method implemented to which logarithmic values
// from the G4EMLOW dataset are loaded directly to enhance performance
//
// -------------------------------------------------------------------
@@ -55,6 +57,7 @@ G4double G4LinInterpolation::Calculate(G4double x, G4int bin,
const G4DataVector& points,
const G4DataVector& data) const
{
//G4cout << "G4LinInterpolation is performed (2 arguments)" << G4endl;
G4int nBins = data.size() - 1;
G4double value = 0.;
if (x < points[0])
@@ -75,3 +78,45 @@ G4double G4LinInterpolation::Calculate(G4double x, G4int bin,
}
return value;
}
//Nicolas A. Karakatsanis: New Calculation method implemented to which logarithmic values
// from the G4EMLOW dataset are loaded directly to enhance performance
G4double G4LinInterpolation::Calculate(G4double x, G4int bin,
const G4DataVector& points,
const G4DataVector& data,
const G4DataVector& log_points,
const G4DataVector& log_data) const
{
//Linear Interpolation is performed on loagarithmic data set
//Equivalent to log-log interpolation on non-loagarithmic data set
//G4cout << "G4LinInterpolation is performed - (4 arguments)" << G4endl;
G4int nBins = data.size() - 1;
G4double value = 0.;
G4double log_x = std::log10(x);
if (x < points[0])
{
value = 0.;
}
else if (bin < nBins)
{
G4double log_e1 = log_points[bin];
G4double log_e2 = log_points[bin+1];
G4double log_d1 = log_data[bin];
G4double log_d2 = log_data[bin+1];
// Values e1, e2, d1 and d2 are the log values of the corresponding
// original energy and data values. Simple linear interpolation performed
// on loagarithmic data should be equivalent to log-log interpolation
value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1);
// Delogarithmize to obtain interpolated value
value = std::pow(10.,value);
}
else
{
value = data[nBins];
}
return value;
}