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G4ClassicalRK4.hh
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27 // $Id: G4ClassicalRK4.hh 101384 2016-11-16 11:03:44Z gcosmo $
28 //
29 //
30 // class G4ClassicalRK4
31 //
32 // Class description:
33 //
34 // Integrate the equations of the motion of a particle in a magnetic field
35 // using the classical 4th Runge-Kutta method.
36 
37 // History:
38 // - Created: J.Apostolakis, V.Grichine - 30.1.97
39 // - Moved into G4MagErrorStepper: W.Wander <wwc@mit.edu> - 12/09/97
40 // - Fix: D.Sorokin add header guard
41 // -------------------------------------------------------------------
42 
43 #ifndef G4ClassicalRK4_HH
44 #define G4ClassicalRK4_HH
45 
46 #include "G4MagErrorStepper.hh"
47 
49 {
50  public: // with description
51 
52  G4ClassicalRK4(G4EquationOfMotion *EquationMotion, G4int numberOfVariables = 6) ;
53 
54  ~G4ClassicalRK4() ;
55 
56  // A stepper that does not know about errors.
57  // It is used by the MagErrorStepper stepper.
58 
59  void DumbStepper( const G4double yIn[],
60  const G4double dydx[],
61  G4double h,
62  G4double yOut[] ) ;
63  // Given values for the variables y[0,..,n-1] and their derivatives
64  // dydx[0,...,n-1] known at x, use the classical 4th Runge-Kutta
65  // method to advance the solution over an interval h and return the
66  // incremented variables as yout[0,...,n-1], which not be a distinct
67  // array from y. The user supplies the routine RightHandSide(x,y,dydx),
68  // which returns derivatives dydx at x. The source is routine rk4 from
69  // NRC p. 712-713 .
70 
71  public: // without description
72 
73  G4int IntegratorOrder() const { return 4; }
74 
75  private:
76 
77  void StepWithEst( const G4double yIn[],
78  const G4double dydx[],
79  G4double h,
80  G4double yOut[],
81  G4double& alpha2,
82  G4double& beta2,
83  const G4double B1[],
84  G4double B2[] );
85  // No longer used. Obsolete.
86 
89  // Private copy constructor and assignment operator.
90 
91  private:
92 
93  // G4int fNumberOfVariables ; // is set default to 6 in constructor
94 
95  G4double *dydxm, *dydxt, *yt; // scratch space - not state
96 };
97 
98 #endif
G4ClassicalRK4 & operator=(const G4ClassicalRK4 &)
G4double * dydxt
void StepWithEst(const G4double yIn[], const G4double dydx[], G4double h, G4double yOut[], G4double &alpha2, G4double &beta2, const G4double B1[], G4double B2[])
double G4double
Definition: G4Types.hh:76
void DumbStepper(const G4double yIn[], const G4double dydx[], G4double h, G4double yOut[])
G4ClassicalRK4(G4EquationOfMotion *EquationMotion, G4int numberOfVariables=6)
G4int IntegratorOrder() const
int G4int
Definition: G4Types.hh:78
G4double * dydxm