G4PhysicsOrderedFreeVector.cc

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//
// G4PhysicsOrderedFreeVector class implementation
//
// Author: Juliet Armstrong (TRIUMF), 13 August 1996
// Revisions:
// - 11.11.2000, H.Kurashige: use STL vector for dataVector and binVector
// - 19.06.2009, V.Ivanchenko: removed hidden bin
// --------------------------------------------------------------------
 
#include "G4PhysicsOrderedFreeVector.hh"
 
// --------------------------------------------------------------------
G4PhysicsOrderedFreeVector::G4PhysicsOrderedFreeVector()
  : G4PhysicsVector()
{
  type = T_G4PhysicsOrderedFreeVector;
}
 
// --------------------------------------------------------------------
G4PhysicsOrderedFreeVector::G4PhysicsOrderedFreeVector(G4double* Energies,
                                                       G4double* Values,
                                                       std::size_t VectorLength)
  : G4PhysicsVector()
{
  type = T_G4PhysicsOrderedFreeVector;
 
  dataVector.reserve(VectorLength);
  binVector.reserve(VectorLength);
 
  for(std::size_t i = 0; i < VectorLength; ++i)
  {
    InsertValues(Energies[i], Values[i]);
  }
}
 
// --------------------------------------------------------------------
G4PhysicsOrderedFreeVector::G4PhysicsOrderedFreeVector(
  const std::vector<G4double>& Energies, const std::vector<G4double>& Values)
  : G4PhysicsVector()
{
  if(Energies.size() != Values.size())
  {
    G4ExceptionDescription ed;
    ed << "The sizes of the two std::vector arguments must be the same";
    G4Exception("G4PhysicsOrderedFreeVector::G4PhysicsOrderedFreeVector()",
                "glob04", FatalException, ed);
  }
 
  type = T_G4PhysicsOrderedFreeVector;
 
  dataVector.reserve(Energies.size());
  binVector.reserve(Energies.size());
 
  for(std::size_t i = 0; i < Energies.size(); ++i)
  {
    InsertValues(Energies[i], Values[i]);
  }
}
 
// --------------------------------------------------------------------
G4PhysicsOrderedFreeVector::~G4PhysicsOrderedFreeVector() {}
 
// --------------------------------------------------------------------
void G4PhysicsOrderedFreeVector::InsertValues(G4double energy, G4double value)
{
  auto binLoc = std::lower_bound(binVector.cbegin(), binVector.cend(), energy);
 
  std::size_t binIdx = binLoc - binVector.cbegin();  // Iterator difference!
 
  auto dataLoc = dataVector.cbegin() + binIdx;
 
  binVector.insert(binLoc, energy);
  dataVector.insert(dataLoc, value);
 
  ++numberOfNodes;
  edgeMin = binVector.front();
  edgeMax = binVector.back();
}
 
// --------------------------------------------------------------------
G4double G4PhysicsOrderedFreeVector::GetEnergy(G4double aValue)
{
  G4double e;
  if(aValue <= GetMinValue())
  {
    e = edgeMin;
  }
  else if(aValue >= GetMaxValue())
  {
    e = edgeMax;
  }
  else
  {
    std::size_t closestBin = FindValueBinLocation(aValue);
    e                      = LinearInterpolationOfEnergy(aValue, closestBin);
  }
  return e;
}
 
// --------------------------------------------------------------------
std::size_t G4PhysicsOrderedFreeVector::FindValueBinLocation(G4double aValue)
{
  std::size_t bin =
    std::lower_bound(dataVector.cbegin(), dataVector.cend(), aValue) -
    dataVector.cbegin() - 1;
  bin = std::min(bin, numberOfNodes - 2);
  return bin;
}
 
// --------------------------------------------------------------------
G4double G4PhysicsOrderedFreeVector::LinearInterpolationOfEnergy(
  G4double aValue, std::size_t bin)
{
  G4double res = binVector[bin];
  G4double del = dataVector[bin + 1] - dataVector[bin];
  if(del > 0.0)
  {
    res += (aValue - dataVector[bin]) * (binVector[bin + 1] - res) / del;
  }
  return res;
}