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G4DormandPrince745.hh
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25 //
26 // G4DormandPrince745
27 //
28 // Class desription:
29 //
30 // An implementation of the 5th order embedded RK method from the paper:
31 // J. R. Dormand and P. J. Prince, "A family of embedded Runge-Kutta formulae"
32 // Journal of computational and applied Math., vol.6, no.1, pp.19-26, 1980.
33 //
34 // DormandPrince7 - 5(4) embedded RK method
35 //
36 
37 // Created: Somnath Banerjee, Google Summer of Code 2015, 25 May 2015
38 // Supervision: John Apostolakis, CERN
39 // --------------------------------------------------------------------
40 #ifndef G4DORMAND_PRINCE_745_HH
41 #define G4DORMAND_PRINCE_745_HH
42 
44 #include "G4FieldUtils.hh"
45 
47 {
48  public:
49 
51  G4int numberOfVariables = 6);
52 
53  virtual void Stepper(const G4double yInput[],
54  const G4double dydx[],
55  G4double hstep,
56  G4double yOutput[],
57  G4double yError[]) override;
58 
59  void Stepper(const G4double yInput[],
60  const G4double dydx[],
61  G4double hstep,
62  G4double yOutput[],
63  G4double yError[],
64  G4double dydxOutput[]);
65 
66  inline void SetupInterpolation() {}
67 
68  inline void Interpolate(G4double tau, G4double yOut[]) const
69  {
70  Interpolate4thOrder(yOut, tau);
71  }
72  // For calculating the output at the tau fraction of Step
73 
74  virtual G4double DistChord() const override;
75 
76  virtual G4int IntegratorOrder() const override { return 4; }
77 
78  const field_utils::State& GetYOut() const { return fyOut; }
79 
80  void Interpolate4thOrder(G4double yOut[], G4double tau) const;
81 
83  void Interpolate5thOrder(G4double yOut[], G4double tau) const;
84 
85  private:
86 
89 
91 
92 };
93 #endif