include/Geant4/G4PhysicsVector.hh

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0025 //
0026 // G4PhysicsVector
0027 //
0028 // Class description:
0029 //
0030 // A physics vector which has values of energy-loss, cross-section,
0031 // and other physics values of a particle in matter in a given
0032 // range of energy, momentum, etc.
0033 // This class serves as the base class for a vector having various
0034 // energy scale, for example like 'log', 'linear', 'free', etc.
0035
0036 // Authors:
0037 // - 02 Dec. 1995, G.Cosmo: Structure created based on object model
0038 // - 03 Mar. 1996, K.Amako: Implemented the 1st version
0039 // Revisions:
0040 // - 11 Nov. 2000, H.Kurashige: Use STL vector for dataVector and binVector
0041 // --------------------------------------------------------------------
0042 #ifndef G4PhysicsVector_hh
0043 #define G4PhysicsVector_hh 1
0044
0045 #include <fstream>
0046 #include <iostream>
0047 #include <vector>
0048
0049 #include "G4Log.hh"
0050 #include "G4PhysicsVectorType.hh"
0051 #include "G4ios.hh"
0052 #include "globals.hh"
0053
0054 class G4PhysicsVector
0055 {
0056 public:
0057   // Default constructor - vector will be filled via Retrieve() method
0058   // Free vector may be filled via InsertValue(..) method
0059   explicit G4PhysicsVector(G4bool spline = false);
0060
0061   // Copy constructor and assignment operator
0062   G4PhysicsVector(const G4PhysicsVector&) = default;
0063   G4PhysicsVector& operator=(const G4PhysicsVector&) = default;
0064
0065   // not used operators
0066   G4PhysicsVector(const G4PhysicsVector&&) = delete;
0067   G4PhysicsVector& operator=(const G4PhysicsVector&&) = delete;
0068   G4bool operator==(const G4PhysicsVector& right) const = delete;
0069   G4bool operator!=(const G4PhysicsVector& right) const = delete;
0070
0071   virtual ~G4PhysicsVector() = default;
0072
0073   // Get the cross-section/energy-loss value corresponding to the
0074   // given energy. An appropriate interpolation is used to calculate
0075   // the value. Consumer code gets changed index and may reuse it
0076   // for the next call to save CPU for bin location.
0077   inline G4double Value(const G4double energy, std::size_t& lastidx) const;
0078
0079   // Get the cross-section/energy-loss value corresponding to the
0080   // given energy. An appropriate interpolation is used to calculate
0081   // the value. This method should be used if bin location cannot be
0082   // kept in the user code.
0083   inline G4double Value(const G4double energy) const;
0084
0085   // Obsolete method to get value, 'isOutRange' is not used anymore.
0086   // This method is kept for the compatibility reason
0087   inline G4double GetValue(const G4double energy, G4bool& isOutRange) const;
0088
0089   // Same as the Value() method above but specialised for log-vector type.
0090   // Note, unlike the general Value() method above, this method will work
0091   // properly only for G4PhysicsLogVector.
0092   inline G4double LogVectorValue(const G4double energy,
0093                                  const G4double theLogEnergy) const;
0094
0095   // Same as the Value() method above but specialised for free vector
0096   // with logarithmic seach of bin number
0097   inline G4double LogFreeVectorValue(const G4double energy,
0098                                      const G4double theLogEnergy) const;
0099
0100   // Returns the value for the specified index of the dataVector
0101   // The boundary check will not be done
0102   inline G4double operator[](const std::size_t index) const;
0103   inline G4double operator()(const std::size_t index) const;
0104
0105   // Put data into the vector at 'index' position.
0106   // Take note that the 'index' starts from '0'.
0107   // It is assumed that energies are already filled.
0108   inline void PutValue(const std::size_t index, const G4double value);
0109
0110   // Returns the value in the energy specified by 'index'
0111   // of the energy vector. The boundary check will not be done.
0112   // Use this when compute cross-section, dEdx, or other value
0113   // before filling the vector by PutValue().
0114   inline G4double Energy(const std::size_t index) const;
0115   inline G4double GetLowEdgeEnergy(const std::size_t index) const;
0116
0117   // Returns the energy of the first and the last point of the vector.
0118   inline G4double GetMinEnergy() const;
0119   inline G4double GetMaxEnergy() const;
0120
0121   // Returns the data of the first and the last point of the vector.
0122   // If the vector is empty returns zeros.
0123   inline G4double GetMinValue() const;
0124   inline G4double GetMaxValue() const;
0125
0126   // Get the total length of the vector
0127   inline std::size_t GetVectorLength() const;
0128
0129   // Computes the lower index the energy bin in case of log-vector i.e.
0130   // in case of vectors with equal bin widths on log-scale
0131   // Note, that no check on the boundary is performed
0132   inline std::size_t ComputeLogVectorBin(const G4double logenergy) const;
0133
0134   // Get physics vector type.
0135   inline G4PhysicsVectorType GetType() const;
0136
0137   // True if using spline interpolation.
0138   inline G4bool GetSpline() const;
0139
0140   // Define verbosity level.
0141   inline void SetVerboseLevel(G4int value);
0142
0143   // Find energy using linear interpolation for vector
0144   // filled by cumulative probability function.
0145   // Assuming that vector is already filled.
0146   inline G4double FindLinearEnergy(const G4double rand) const;
0147
0148   // Find low edge index of a bin for given energy.
0149   // Min value 0, max value idxmax.
0150   std::size_t FindBin(const G4double energy, std::size_t idx) const;
0151
0152   // Scale all values of the vector by factorV, energies by vectorE.
0153   // AFter this method FillSecondDerivatives(...) should be called.
0154   // This method may be applied for example after retrieving a vector
0155   // from an external file to convert values into Geant4 units.
0156   void ScaleVector(const G4double factorE, const G4double factorV);
0157
0158   // This method should be called when the vector is fully filled
0159   // There are 3 types of second derivative computations:
0160   //    fSplineSimple -     2d derivative continues
0161   //    fSplineBase -       3d derivative continues (the default)
0162   //    fSplineFixedEdges - 3d derivatives continues, 1st and last
0163   //                        derivatives are fixed
0164   void FillSecondDerivatives(const G4SplineType = G4SplineType::Base,
0165                              const G4double dir1 = 0.0,
0166                              const G4double dir2 = 0.0);
0167
0168   // This method can be applied if both energy and data values
0169   // grow monotonically, for example, if in this vector a
0170   // cumulative probability density function is stored.
0171   G4double GetEnergy(const G4double value) const;
0172
0173   // To store/retrieve persistent data to/from file streams.
0174   G4bool Store(std::ofstream& fOut, G4bool ascii = false) const;
0175   G4bool Retrieve(std::ifstream& fIn, G4bool ascii = false);
0176
0177   // Print vector
0178   friend std::ostream& operator<<(std::ostream&, const G4PhysicsVector&);
0179   void DumpValues(G4double unitE = 1.0, G4double unitV = 1.0) const;
0180
0181 protected:
0182
0183   // The default implements a free vector initialisation.
0184   virtual void Initialise();
0185
0186   void PrintPutValueError(std::size_t index, G4double value,
0187                           const G4String& text);
0188
0189 private:
0190
0191   void ComputeSecDerivative0();
0192   void ComputeSecDerivative1();
0193   void ComputeSecDerivative2(const G4double firstPointDerivative,
0194                              const G4double endPointDerivative);
0195   // Internal methods for computing of spline coeffitients
0196
0197   // Linear or spline interpolation.
0198   inline G4double Interpolation(const std::size_t idx,
0199                                 const G4double energy) const;
0200
0201   // Assuming (edgeMin <= energy <= edgeMax).
0202   inline std::size_t LogBin(const G4double energy, const G4double loge) const;
0203   inline std::size_t BinaryBin(const G4double energy) const;
0204   inline std::size_t GetBin(const G4double energy) const;
0205
0206 protected:
0207
0208   G4double edgeMin = 0.0;  // Energy of first point
0209   G4double edgeMax = 0.0;  // Energy of the last point
0210
0211   G4double invdBin = 0.0;  // 1/Bin width for linear and log vectors
0212   G4double logemin = 0.0;  // used only for log vector
0213
0214   G4double iBin1 = 0.0;  // 1/Bin width for scale log vector
0215   G4double lmin1 = 0.0;  // used for log search of free vector
0216
0217   G4int verboseLevel = 0;
0218   std::size_t idxmax = 0;
0219   std::size_t imax1 = 0;
0220   std::size_t numberOfNodes = 0;
0221   std::size_t nLogNodes = 0;
0222
0223   G4PhysicsVectorType type = T_G4PhysicsFreeVector;
0224   // The type of PhysicsVector (enumerator)
0225
0226   std::vector<G4double> binVector;      // energy
0227   std::vector<G4double> dataVector;     // crossection/energyloss
0228   std::vector<G4double> secDerivative;  // second derivatives
0229   std::vector<std::size_t> scale;       // log seach
0230
0231 private:
0232
0233   G4bool useSpline = false;
0234 };
0235
0236 #include "G4PhysicsVector.icc"
0237
0238 #endif