G4PhysicsOrderedFreeVector.cc

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// $Id: G4PhysicsOrderedFreeVector.cc 74256 2013-10-02 14:24:02Z gcosmo $
//
// PhysicsOrderedFreeVector Class Implementation
//
// File:        G4PhysicsOrderedFreeVector.cc
// Version:     2.0
// Created:     1996-08-13
// Author:      Juliet Armstrong
// Updated:     1997-03-25 by Peter Gumplinger
//              > cosmetics (only)
//              1998-11-11 by Peter Gumplinger
//              > initialize all data members of the base class in 
//                derived class constructors
//              2000-11-11 by H.Kurashige
//              > use STL vector for dataVector and binVector
//              2009-06-19 by V.Ivanchenko 
//              > removed hidden bin 
//              2013-10-02 by V.Ivanchenko removed FindBinLocation   
//
// mail:        gum@triumf.ca
//

#include "G4PhysicsOrderedFreeVector.hh"

// Class Implementation

        // Constructors

G4PhysicsOrderedFreeVector::G4PhysicsOrderedFreeVector(G4double *Energies,
                                                       G4double *Values,
                                                       size_t VectorLength)
  : G4PhysicsVector()
{
  type = T_G4PhysicsOrderedFreeVector;

  for (size_t i = 0 ; i < VectorLength ; i++)
    {
      InsertValues(Energies[i], Values[i]);
    }
}

G4PhysicsOrderedFreeVector::G4PhysicsOrderedFreeVector()
  : G4PhysicsVector()
{
  type = T_G4PhysicsOrderedFreeVector;
}

        // Destructors

G4PhysicsOrderedFreeVector::~G4PhysicsOrderedFreeVector() {}

        // Methods
  
void G4PhysicsOrderedFreeVector::InsertValues(G4double energy, G4double value)
{
        std::vector<G4double>::iterator binLoc =
                 std::lower_bound(binVector.begin(), binVector.end(), energy);

        size_t binIdx = binLoc - binVector.begin(); // Iterator difference!

        std::vector<G4double>::iterator dataLoc = dataVector.begin() + binIdx;

        binVector.insert(binLoc, energy);
        dataVector.insert(dataLoc, value);

        numberOfNodes++;
        edgeMin = binVector.front();
        edgeMax = binVector.back();
}

G4double  G4PhysicsOrderedFreeVector::GetEnergy(G4double aValue)
{

        if (aValue <= GetMinValue()) {
                return GetMinLowEdgeEnergy();
        } else if (aValue >= GetMaxValue()) {
                return GetMaxLowEdgeEnergy();
        } else { 
        size_t closestBin = FindValueBinLocation(aValue);
        G4double theEnergy = LinearInterpolationOfEnergy(aValue, closestBin);

        return theEnergy;
        }
}

size_t G4PhysicsOrderedFreeVector::FindValueBinLocation(G4double aValue)
{
   G4int n1 = 0;
   G4int n2 = numberOfNodes/2;
   G4int n3 = numberOfNodes - 1;
   while (n1 != n3 - 1) {
      if (aValue > dataVector[n2])
         { n1 = n2; }
      else
         { n3 = n2; }
      n2 = n1 + (n3 - n1 + 1)/2;
   }
   return (size_t)n1;
}

G4double G4PhysicsOrderedFreeVector::LinearInterpolationOfEnergy(G4double aValue,
                                 size_t theLocBin)
{
  G4double intplFactor = (aValue-dataVector[theLocBin])
     / (dataVector[theLocBin+1]-dataVector[theLocBin]); // Interpolation factor

  return binVector[theLocBin] +
         ( binVector[theLocBin+1]-binVector[theLocBin] ) * intplFactor;
}