Geant4  10.03.p03
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
G4BogackiShampine23.hh
Go to the documentation of this file.
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
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 
49 
51 
52 
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 
76 
77 
78  private:
79 
80  G4double *ak2, *ak3, *ak4, *yTemp, *yIn;
81  // for storing intermediate 'k' values in stepper
82  G4double *pseudoDydx_for_DistChord;
83 
84  G4double fLastStepLength;
85  G4double *fLastInitialVector, *fLastFinalVector,
86  *fLastDyDx, *fMidVector, *fMidError;
87  // for DistChord calculations
88 
89  G4BogackiShampine23* fAuxStepper;
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 */
99 
100 
101 
102 
103 
104 
105 
106 
107 
108 
109 
110 
111 
112 
113 
114 
115 
116 
117 
118 
119 
120 
121 
122 
123 
124 
125 
126 
127 
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
void Stepper(const G4double y[], const G4double dydx[], G4double h, G4double yout[], G4double yerr[])
double G4double
Definition: G4Types.hh:76
G4double * getLastDydx()