Gabriele Cosmo
123 lines
4.4 KiB
C++
123 lines
4.4 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// $Id: G4LinInterpolation.cc,v 1.5 2009/09/25 07:41:34 sincerti Exp $
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// GEANT4 tag $Name: geant4-09-03 $
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//
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// Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
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//
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// History:
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// -----------
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// 31 Jul 2001 MGP Created
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// 14 JUn 2009 NAK New Calculation method implemented to which logarithmic values
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// from the G4EMLOW dataset are loaded directly to enhance performance
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//
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// -------------------------------------------------------------------
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#include "G4LinInterpolation.hh"
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// Constructor
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G4LinInterpolation::G4LinInterpolation()
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{ }
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// Destructor
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G4LinInterpolation::~G4LinInterpolation()
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{ }
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G4VDataSetAlgorithm* G4LinInterpolation::Clone() const
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{ return new G4LinInterpolation; }
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G4double G4LinInterpolation::Calculate(G4double x, G4int bin,
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const G4DataVector& points,
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const G4DataVector& data) const
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{
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//G4cout << "G4LinInterpolation is performed (2 arguments)" << G4endl;
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G4int nBins = data.size() - 1;
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G4double value = 0.;
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if (x < points[0])
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{
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value = 0.;
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}
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else if (bin < nBins)
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{
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G4double e1 = points[bin];
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G4double e2 = points[bin+1];
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G4double d1 = data[bin];
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G4double d2 = data[bin+1];
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value = d1 + (d2 - d1)*(x - e1)/(e2 - e1);
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}
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else
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{
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value = data[nBins];
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}
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return value;
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}
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//Nicolas A. Karakatsanis: New Calculation method implemented to which logarithmic values
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// from the G4EMLOW dataset are loaded directly to enhance performance
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G4double G4LinInterpolation::Calculate(G4double x, G4int bin,
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const G4DataVector& points,
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const G4DataVector& data,
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const G4DataVector& log_points,
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const G4DataVector& log_data) const
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{
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//Linear Interpolation is performed on loagarithmic data set
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//Equivalent to log-log interpolation on non-loagarithmic data set
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//G4cout << "G4LinInterpolation is performed - (4 arguments)" << G4endl;
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G4int nBins = data.size() - 1;
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G4double value = 0.;
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G4double log_x = std::log10(x);
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if (x < points[0])
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{
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value = 0.;
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}
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else if (bin < nBins)
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{
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G4double log_e1 = log_points[bin];
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G4double log_e2 = log_points[bin+1];
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G4double log_d1 = log_data[bin];
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G4double log_d2 = log_data[bin+1];
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// Values e1, e2, d1 and d2 are the log values of the corresponding
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// original energy and data values. Simple linear interpolation performed
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// on loagarithmic data should be equivalent to log-log interpolation
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value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1);
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// Delogarithmize to obtain interpolated value
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value = std::pow(10.,value);
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}
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else
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{
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value = data[nBins];
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}
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return value;
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}
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