Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/include/G4SimpleRunge.hh

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  1 //
  2 // ********************************************************************
  3 // * License and Disclaimer                                           *
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 24 // ********************************************************************
 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 
 45 class G4SimpleRunge : public G4MagErrorStepper
 46 {
 47   public:
 48 
 49     G4SimpleRunge(G4EquationOfMotion* EquationRhs, G4int numberOfVariables = 6);
 50    ~G4SimpleRunge() override;
 51       // Constructor and destructor.
 52 
 53     void DumbStepper( const G4double y[],
 54                       const G4double dydx[],
 55                             G4double h,
 56                             G4double yout[] ) override;
 57 
 58     inline G4int IntegratorOrder() const override { return 2; }
 59 
 60   private:
 61 
 62     G4int fNumberOfVariables = 0;
 63 
 64     G4double* dydxTemp = nullptr;
 65     G4double* yTemp = nullptr;
 66 };
 67 
 68 #endif
 69