| Geant4 Cross Reference |
1 // 1 //
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4RKG3_Stepper << 23 //
>> 24 // $Id: G4RKG3_Stepper.hh,v 1.8 2001/07/11 09:59:09 gunter Exp $
>> 25 // GEANT4 tag $Name: geant4-05-01-patch-01 $
>> 26 //
>> 27 //
>> 28 // class G4RKG3_Stepper
27 // 29 //
28 // Class description: 30 // Class description:
29 // 31 //
30 // Runga-Kutta integrator stepper from Geant3. << 32 // Integrator Runga-Kutta Stepper from Geant3.
31 33
32 // Created: J.Apostolakis, V.Grichine - 30.01. << 34 // History:
33 // ------------------------------------------- << 35 // - Created. J.Apostolakis, V.Grichine - 30.01.97
34 #ifndef G4RKG3_STEPPER_HH << 36
35 #define G4RKG3_STEPPER_HH << 37 #ifndef G4RKG3_Stepper_hh
>> 38 #define G4RKG3_Stepper_hh
36 39
37 #include "G4Types.hh" <<
38 #include "G4MagIntegratorStepper.hh" 40 #include "G4MagIntegratorStepper.hh"
39 #include "G4ThreeVector.hh" 41 #include "G4ThreeVector.hh"
40 << 42 #include "G4Mag_EqRhs.hh"
41 class G4Mag_EqRhs; <<
42 43
43 class G4RKG3_Stepper : public G4MagIntegratorS 44 class G4RKG3_Stepper : public G4MagIntegratorStepper
44 { 45 {
45 public: << 46 public: // with description
46 47
47 G4RKG3_Stepper(G4Mag_EqRhs* EqRhs); << 48 G4RKG3_Stepper(G4Mag_EqRhs *EqRhs)
>> 49 : G4MagIntegratorStepper(EqRhs,6){ G4Exception(" G4RKG3_Stepper: is not available in the current version.");}
48 // Integrate over 6 variables only: pos 50 // Integrate over 6 variables only: position & velocity.
49 // Not implemented yet ! <<
50 51
51 ~G4RKG3_Stepper() override; << 52 ~G4RKG3_Stepper(){;}
52 53
53 void Stepper( const G4double yIn[], 54 void Stepper( const G4double yIn[],
54 const G4double dydx[], << 55 const G4double dydx[],
55 G4double h, << 56 G4double h,
56 G4double yOut[], << 57 G4double yOut[],
57 G4double yErr[] ) over << 58 G4double yErr[] );
58 // The method which must be provided, ev 59 // The method which must be provided, even if less efficient.
59 60
60 G4double DistChord() const override ; << 61 G4double DistChord() const ;
61 62
62 void StepNoErr( const G4double tIn[8], << 63 void StepNoErr( const G4double tIn[7],
63 const G4double dydx[6], << 64 const G4double dydx[7],
64 G4double Step, << 65 G4double Step,
65 G4double tOut[8], << 66 G4double tOut[7],
66 G4double B[3] ); << 67 G4double B[3] );
67 // Integrator RK Stepper from G3 with on 68 // Integrator RK Stepper from G3 with only two field evaluation per
68 // Step. It is used in propagation initi 69 // Step. It is used in propagation initial Step by small substeps
69 // after solution error and delta geomet 70 // after solution error and delta geometry considerations.
70 // B[3] is magnetic field which is passe 71 // B[3] is magnetic field which is passed from substep to substep.
71 72
72 void StepWithEst( const G4double tIn[8], << 73 void StepWithEst( const G4double tIn[7],
73 const G4double dydx[6], << 74 const G4double dydx[7],
74 G4double Step, << 75 G4double Step,
75 G4double tOut[8], << 76 G4double tOut[7],
76 G4double& alpha2, << 77 G4double& alpha2, // to delete ?
77 G4double& beta2, << 78 G4double& beta2,
78 const G4double B1[3], << 79 const G4double B1[3],
79 G4double B2[3] ); << 80 G4double B2[3] );
80 // Integrator for RK from G3 with evalua << 81 // Integrator for RK from G3 with evaluation of error in solution and delta
81 // delta geometry based on naive similar << 82 // geometry based on naive similarity with the case of uniform magnetic field.
82 // magnetic field. <<
83 // B1[3] is input and is the first magn 83 // B1[3] is input and is the first magnetic field values
84 // B2[3] is output and is the final magn 84 // B2[3] is output and is the final magnetic field values.
85 85
86 inline G4int IntegratorOrder() const overr << 86 public: // without description
>> 87
>> 88 G4int IntegratorOrder() const { return 4; }
>> 89
>> 90 protected:
>> 91 // void Field( const G4double Point[3],
>> 92 // G4double Bfield[3] ) const
>> 93 // { EqRhs-> GetFieldValue( Point, Bfield ) ; }
87 94
88 private: 95 private:
89 96
90 G4ThreeVector fyInitial, 97 G4ThreeVector fyInitial,
91 fyMidPoint, << 98 fyMidPoint,
92 fyFinal; << 99 fyFinal ;
93 G4ThreeVector fpInitial; <<
94 G4ThreeVector BfldIn; <<
95 G4double hStep = 0.0; <<
96 }; 100 };
97 101
98 #endif 102 #endif
99 103