Geant4  10.01.p01
G4ImplicitEuler.hh
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27 // $Id: G4ImplicitEuler.hh 66356 2012-12-18 09:02:32Z gcosmo $
28 //
29 //
30 // class G4ImplicitEuler
31 //
32 // Class description:
33 //
34 // Implicit Euler stepper for magnetic field:
35 // x_1 = x_0 + h/2 * ( dx(t_0,x_0) + dx(t_0+h,x_0+h*dx(t_0,x_0) ) )
36 //
37 // Second order solver.
38 // Takes the current derivative and add it to the current position.
39 // Takes the output and its derivative. Adds the mean of both
40 // derivatives to form the final output.
41 
42 // W. Wander <wwc@mit.edu> 12/09/97
43 // -------------------------------------------------------------------
44 
45 #ifndef G4IMPLICITEULER_HH
46 #define G4IMPLICITEULER_HH
47 
48 #include "G4MagErrorStepper.hh"
49 
51 {
52 
53  public: // with description
54 
55  G4ImplicitEuler(G4EquationOfMotion *EqRhs, G4int numberOfVariables = 6) ;
57 
58  void DumbStepper( const G4double y[] ,
59  const G4double dydx[] ,
60  G4double h ,
61  G4double yout[] ) ;
62 
63  public: // without description
64 
65  G4int IntegratorOrder() const { return 2 ; } ;
66 
67  private:
68 
71  // Temporaries, created to avoid new/delete on every call
72 };
73 
74 #endif /* G4IMPLICITEULER_HH */
G4int IntegratorOrder() const
int G4int
Definition: G4Types.hh:78
void DumbStepper(const G4double y[], const G4double dydx[], G4double h, G4double yout[])
double G4double
Definition: G4Types.hh:76
G4double * dydxTemp
G4ImplicitEuler(G4EquationOfMotion *EqRhs, G4int numberOfVariables=6)