Geant4  10.01.p02
G4RKG3_Stepper.hh
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28 // $Id: G4RKG3_Stepper.hh 68055 2013-03-13 14:43:28Z gcosmo $
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31 //
32 // class G4RKG3_Stepper
33 //
34 // Class description:
35 //
36 // Integrator Runga-Kutta Stepper from Geant3.
37 //
38 // History:
39 // - Created. J.Apostolakis, V.Grichine - 30.01.97
40 // -------------------------------------------------------------------
41 
42 #ifndef G4RKG3_Stepper_hh
43 #define G4RKG3_Stepper_hh
44 
45 #include "G4Types.hh"
47 #include "G4ThreeVector.hh"
48 
49 class G4Mag_EqRhs;
50 
52 {
53  public: // with description
54 
56  // Integrate over 6 variables only: position & velocity.
57  // Not implemented yet !
58 
60 
61  void Stepper( const G4double yIn[],
62  const G4double dydx[],
63  G4double h,
64  G4double yOut[],
65  G4double yErr[] );
66  // The method which must be provided, even if less efficient.
67 
68  G4double DistChord() const ;
69 
70  void StepNoErr( const G4double tIn[8],
71  const G4double dydx[6],
72  G4double Step,
73  G4double tOut[8],
74  G4double B[3] );
75  // Integrator RK Stepper from G3 with only two field evaluation per
76  // Step. It is used in propagation initial Step by small substeps
77  // after solution error and delta geometry considerations.
78  // B[3] is magnetic field which is passed from substep to substep.
79 
80  void StepWithEst( const G4double tIn[8],
81  const G4double dydx[6],
82  G4double Step,
83  G4double tOut[8],
84  G4double& alpha2,
85  G4double& beta2,
86  const G4double B1[3],
87  G4double B2[3] );
88  // Integrator for RK from G3 with evaluation of error in solution and delta
89  // geometry based on naive similarity with the case of uniform magnetic field.
90  // B1[3] is input and is the first magnetic field values
91  // B2[3] is output and is the final magnetic field values.
92 
93  public: // without description
94 
95  G4int IntegratorOrder() const { return 4; }
96 
97  private:
98 
100  fyMidPoint,
101  fyFinal;
105 };
106 
107 #endif
G4double DistChord() const
void StepWithEst(const G4double tIn[8], const G4double dydx[6], G4double Step, G4double tOut[8], G4double &alpha2, G4double &beta2, const G4double B1[3], G4double B2[3])
CLHEP::Hep3Vector G4ThreeVector
int G4int
Definition: G4Types.hh:78
G4ThreeVector BfldIn
G4ThreeVector fpInitial
G4RKG3_Stepper(G4Mag_EqRhs *EqRhs)
void Stepper(const G4double yIn[], const G4double dydx[], G4double h, G4double yOut[], G4double yErr[])
G4ThreeVector fyInitial
G4ThreeVector fyMidPoint
Definition: Step.hh:41
void StepNoErr(const G4double tIn[8], const G4double dydx[6], G4double Step, G4double tOut[8], G4double B[3])
G4ThreeVector fyFinal
double G4double
Definition: G4Types.hh:76
G4int IntegratorOrder() const