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G4FSALDormandPrince745.hh
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25 //
26 // G4FSALDormandPrince745
27 //
28 // Class description:
29 //
30 // DormandPrince7 - 5(4) FSAL stepper
31 
32 // Created: Somnath Banerjee, Google Summer of Code 2015, 25 May 2015
33 // Supervision: John Apostolakis, CERN
34 // --------------------------------------------------------------------
35 #ifndef G4FSALDORMANDPRINCE745_HH
36 #define G4FSALDORMANDPRINCE745_HH
37 
39 
41 {
42  public:
43 
45  G4int numberOfVariables = 6,
46  G4bool primary = true);
48 
51 
52  void Stepper( const G4double y[],
53  const G4double dydx[],
54  G4double h,
55  G4double yout[],
56  G4double yerr[],
57  G4double nextDydx[]) ;
58  void interpolate( const G4double yInput[],
59  const G4double dydx[],
60  G4double yOut[],
61  G4double Step,
62  G4double tau ) ;
63 
64  void SetupInterpolate( const G4double yInput[],
65  const G4double dydx[],
66  const G4double Step );
67  // For higher order Interpolant
68 
69  void Interpolate( const G4double yInput[],
70  const G4double dydx[],
71  const G4double Step,
72  G4double yOut[],
73  G4double tau );
74  // For calculating the output at the tau fraction of Step
75 
76 
77  G4double DistChord() const;
78  inline G4int IntegratorOrder() const {return 4; }
79  inline G4bool isFSAL() const { return true; }
80 
81  private:
82 
83  G4double *ak2, *ak3, *ak4, *ak5, *ak6, *ak7,
84  *ak8, *ak9, // For additional stages in the interpolant
85  *yTemp, *yIn;
86 
88  // Only for use with DistChord()
89 
93  // For DistChord() calculations
94 
96 };
97 
98 #endif