Geant4  10.03
G4BogackiShampine23.hh
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25 //
26 // Bogacki-Shampine - 4 - 3(2) non-FSAL implementation
27 //
28 // An implementation of the embedded RK method from the paper
29 // [1] P. Bogacki and L. F. Shampine, “A 3(2) pair of Runge - Kutta formulas,”
30 // Appl. Math. Lett., vol. 2, no. 4, pp. 321–325, Jan. 1989.
31 //
32 // This version does not utilise the FSAL property of the method,
33 // which would allow the reuse of the last derivative in the next step.
34 // (Alternative FSAL implementation created with revised interface)
35 //
36 // Implemented by Somnath Banerjee
37 // Work supported by the Google Summer of Code 2015.
38 // Supervision / code review: John Apostolakis
39 //
40 // First version: 20 May 2015
41 //
43 
44 
45 #ifndef G4BOGACKI_SHAMPINE23_H
46 #define G4BOGACKI_SHAMPINE23_H
47 
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53  public:
54  //constructor
56  G4int numberOfVariables = 6,
57  G4bool primary= true ) ;
58 
59  //destructor
61 
62  //Stepper
63  void Stepper(const G4double y[],
64  const G4double dydx[],
65  G4double h,
66  G4double yout[],
67  G4double yerr[] ) ;
68 
69  G4double DistChord() const;
70  G4int IntegratorOrder() const { return 2; }
71  G4bool isFSAL() const{ return true; }
73 
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78  private:
79 
81  // for storing intermediate 'k' values in stepper
83 
87  // for DistChord calculations
88 
90 
91 // G4int No_of_vars;
92 // G4double hinit, tinit, tmax, *yinit;
93 // double hmax, hmin, safe_const, err0, Step_factor;
94 // void (*derivs)(double, double *, double *);
95 
96 };
97 
98 #endif /* G4BogackiShampine23 */
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G4double * pseudoDydx_for_DistChord
G4BogackiShampine23(G4EquationOfMotion *EqRhs, G4int numberOfVariables=6, G4bool primary=true)
int G4int
Definition: G4Types.hh:78
G4BogackiShampine23 & operator=(const G4BogackiShampine23 &)
G4int IntegratorOrder() const
bool G4bool
Definition: G4Types.hh:79
G4double DistChord() const
G4BogackiShampine23 * fAuxStepper
void Stepper(const G4double y[], const G4double dydx[], G4double h, G4double yout[], G4double yerr[])
double G4double
Definition: G4Types.hh:76
G4double * getLastDydx()