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G4SimpleRunge.hh
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25 //
26 // G4SimpleRunge
27 //
28 // Class description:
29 //
30 // Simple Runge:
31 //
32 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
33 //
34 // Second order solver.
35 // Takes the derivative at a position to be assumed at the middle of the
36 // Step and adds it to the current position.
37 
38 // Created: W.Wander <wwc@mit.edu>, 12/09/1997
39 // -------------------------------------------------------------------
40 #ifndef G4SIMPLERUNGE_HH
41 #define G4SIMPLERUNGE_HH
42 
43 #include "G4MagErrorStepper.hh"
44 
46 {
47 
48  public: // with description
49 
50  G4SimpleRunge(G4EquationOfMotion* EquationRhs, G4int numberOfVariables = 6) ;
52  // Constructor and destructor.
53 
54  void DumbStepper( const G4double y[],
55  const G4double dydx[],
56  G4double h,
57  G4double yout[] );
58 
59  public: // without description
60 
61  inline G4int IntegratorOrder() const { return 2; }
62 
63  private:
64 
66 
67  G4double* dydxTemp = nullptr;
68  G4double* yTemp = nullptr;
69  // scratch space
70 };
71 
72 #endif