Gabriele Cosmo
290 lines
8.9 KiB
Plaintext
290 lines
8.9 KiB
Plaintext
//
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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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//
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//
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//---------------------------------------------------------------
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// GEANT 4 class source file
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//
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// G4PhysicsVector.icc
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//
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// Description:
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// A physics vector which has values of energy-loss, cross-section,
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// and other physics values of a particle in matter in a given
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// range of the energy, momentum, etc.
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// This class serves as the base class for a vector having various
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// energy scale, for example like 'log', 'linear', 'free', etc.
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//
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//---------------------------------------------------------------
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inline
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G4double G4PhysicsVector::operator[](const size_t index) const
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{
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return dataVector[index];
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}
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//---------------------------------------------------------------
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inline
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G4double G4PhysicsVector::operator()(const size_t index) const
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{
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return dataVector[index];
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}
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//---------------------------------------------------------------
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inline
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G4double G4PhysicsVector::Energy(const size_t index) const
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{
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return binVector[index];
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}
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//---------------------------------------------------------------
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inline
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G4double G4PhysicsVector::GetMaxEnergy() const
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{
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return edgeMax;
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}
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//---------------------------------------------------------------
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inline
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size_t G4PhysicsVector::GetVectorLength() const
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{
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return numberOfNodes;
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}
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//------------------------------------------------
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inline
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G4double G4PhysicsVector::LinearInterpolation(size_t idx, G4double e) const
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{
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// Linear interpolation is used to get the value. Before this method
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// is called it is ensured that the energy is inside the bin
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// 0 < idx < numberOfNodes-1
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return dataVector[idx] +
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( dataVector[idx + 1]-dataVector[idx] ) * (e - binVector[idx])
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/( binVector[idx + 1]-binVector[idx] );
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}
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//---------------------------------------------------------------
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inline
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G4double G4PhysicsVector::SplineInterpolation(size_t idx, G4double e) const
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{
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// Spline interpolation is used to get the value. Before this method
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// is called it is ensured that the energy is inside the bin
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// 0 < idx < numberOfNodes-1
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static const G4double onesixth = 1.0/6.0;
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// check bin value
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G4double x1 = binVector[idx];
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G4double x2 = binVector[idx + 1];
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G4double delta = x2 - x1;
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G4double a = (x2 - e)/delta;
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G4double b = (e - x1)/delta;
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// Final evaluation of cubic spline polynomial for return
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G4double y1 = dataVector[idx];
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G4double y2 = dataVector[idx + 1];
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G4double res = a*y1 + b*y2 +
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( (a*a*a - a)*secDerivative[idx] +
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(b*b*b - b)*secDerivative[idx + 1] )*delta*delta*onesixth;
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return res;
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}
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//---------------------------------------------------------------
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inline
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G4double G4PhysicsVector::Interpolation(size_t idx, G4double e) const
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{
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return useSpline ? SplineInterpolation(idx, e) : LinearInterpolation(idx, e);
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}
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//---------------------------------------------------------------
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inline
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void G4PhysicsVector::PutValue(size_t index, G4double theValue)
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{
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if(index >= numberOfNodes) { PrintPutValueError(index); }
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dataVector[index] = theValue;
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}
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//---------------------------------------------------------------
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inline
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G4bool G4PhysicsVector::IsFilledVectorExist() const
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{
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return (numberOfNodes > 0) ? true : false;
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}
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//---------------------------------------------------------------
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inline
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G4PhysicsVectorType G4PhysicsVector::GetType() const
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{
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return type;
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}
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//---------------------------------------------------------------
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// Flag useSpline is "true" only if second derivatives are filled
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inline
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void G4PhysicsVector::SetSpline(G4bool val)
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{
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if(val) {
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if(0 == secDerivative.size() && 0 < dataVector.size()) {
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FillSecondDerivatives();
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}
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} else {
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useSpline = false;
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secDerivative.clear();
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}
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}
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//---------------------------------------------------------------
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inline
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void G4PhysicsVector::SetVerboseLevel(G4int value)
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{
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verboseLevel = value;
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}
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//---------------------------------------------------------------
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/*
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inline
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G4int G4PhysicsVector::GetVerboseLevel() const
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{
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return verboseLevel;
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}
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*/
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//---------------------------------------------------------------
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inline
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size_t G4PhysicsVector::FindBinLocation(G4double theEnergy) const
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{
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size_t bin;
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if(type == T_G4PhysicsLogVector) {
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bin = size_t(G4Log(theEnergy)*invdBin - baseBin);
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if(bin > 0 && theEnergy < binVector[bin]) { --bin; }
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else if(theEnergy > binVector[bin+1]) { ++bin; }
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} else if(type == T_G4PhysicsLinearVector) {
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bin = size_t( theEnergy*invdBin - baseBin );
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if(bin > 0 && theEnergy < binVector[bin]) { --bin; }
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else if(theEnergy > binVector[bin+1]) { ++bin; }
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} else {
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// Bin location proposed by K.Genser (FNAL)
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bin = std::lower_bound(binVector.begin(), binVector.end(), theEnergy)
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- binVector.begin() - 1;
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}
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return std::min(bin, numberOfNodes-2);
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}
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//---------------------------------------------------------------
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inline size_t G4PhysicsVector::FindBin(G4double e, size_t idx) const
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{
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size_t id = idx;
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if(e < binVector[1]) {
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id = 0;
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} else if(e >= binVector[numberOfNodes-2]) {
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id = numberOfNodes - 2;
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} else if(idx >= numberOfNodes-2 || e < binVector[idx]
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|| e > binVector[idx+1]) {
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id = FindBinLocation(e);
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}
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return id;
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}
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//---------------------------------------------------------------
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inline
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size_t G4PhysicsVector::ComputeLogVectorBin(const G4double loge) const
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{
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return size_t(std::max(0., std::min(loge*invdBin-baseBin, numberOfNodes-2.)));
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}
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//---------------------------------------------------------------
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inline
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G4double G4PhysicsVector::Value(G4double theEnergy) const
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{
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size_t idx=0;
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return Value(theEnergy, idx);
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}
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//---------------------------------------------------------------
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inline
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G4double G4PhysicsVector::GetValue(G4double theEnergy, G4bool&) const
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{
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size_t idx=0;
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return Value(theEnergy, idx);
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}
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//---------------------------------------------------------------
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inline
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G4double G4PhysicsVector::LogVectorValue(const G4double theEnergy,
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const G4double theLogEnergy) const
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{
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// handle cases below/above the enrgy grid (by ek, idx that gives b=0/1)
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// ek = x[0] if e<=x[0] and idx will be 0 ^ b=0 => so y=y0
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// ek = x[N-1] if e>=x[N-1] and idx will be N-2 ^ b=1 => so y=y_{N-1}
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const G4double ek = std::max(binVector[0],
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std::min(binVector[numberOfNodes-1], theEnergy));
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// compute the lowerindex of the bin (idx \in [0,N-2] will be guaranted)
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const size_t idx = ComputeLogVectorBin(theLogEnergy);
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// perform the interpolation
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const G4double x1 = binVector[idx];
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const G4double x2 = binVector[idx+1];
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const G4double dl = x2-x1;
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// note: all corner cases of the previous methods are covered and eventually
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// gives b=0/1 that results in y=y0\y_{N-1} if e<=x[0]/e>=x[N-1] or
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// y=y_i/y_{i+1} if e<x[i]/e>=x[i+1] due to small numerical errors
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const G4double b = std::max(0., std::min(1., (ek - x1)/dl));
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if (useSpline) { // spline interpolation
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const G4double os = 0.166666666667; // 1./6.
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const G4double a = 1.0 - b;
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const G4double c0 = (a*a*a-a)*secDerivative[idx];
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const G4double c1 = (b*b*b-b)*secDerivative[idx+1];
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return a*dataVector[idx] + b*dataVector[idx+1] + (c0+c1)*dl*dl*os;
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} else { // linear interpolation
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const G4double y1 = dataVector[idx];
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const G4double y2 = dataVector[idx+1];
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return y1 + b*(y2-y1);
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}
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}
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