Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/include/G4SimpleHeum.hh

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  1 //
  2 // ********************************************************************
  3 // * License and Disclaimer                                           *
  4 // *                                                                  *
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  6 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
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  8 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
  9 // * include a list of copyright holders.                             *
 10 // *                                                                  *
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 14 // * regarding  this  software system or assume any liability for its *
 15 // * use.  Please see the license in the file  LICENSE  and URL above *
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 17 // *                                                                  *
 18 // * This  code  implementation is the result of  the  scientific and *
 19 // * technical work of the GEANT4 collaboration.                      *
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 23 // * acceptance of all terms of the Geant4 Software license.          *
 24 // ********************************************************************
 25 //
 26 // G4SimpleHeum
 27 //
 28 // Class description:
 29 //
 30 // Simple Heum stepper for magnetic field:
 31 //        x_1 = x_0  +
 32 //              h * 1/4 * dx(t0,x0)  +
 33 //                  3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0)))) 
 34 //
 35 // Third order solver.
 36 
 37 // Created: W.Wander <wwc@mit.edu>, 12/09/1997
 38 // -------------------------------------------------------------------
 39 #ifndef G4SIMPLEHEUM_HH
 40 #define G4SIMPLEHEUM_HH
 41 
 42 #include "G4MagErrorStepper.hh"
 43 
 44 class G4SimpleHeum : public G4MagErrorStepper
 45 {
 46   public:
 47 
 48     G4SimpleHeum(G4EquationOfMotion* EqRhs, G4int num_variables = 6);
 49    ~G4SimpleHeum() override;
 50       // Constructor and destructor.
 51 
 52     void DumbStepper( const G4double y[],
 53                       const G4double dydx[],
 54                             G4double h,
 55                             G4double yout[] ) override;
 56   
 57     inline G4int IntegratorOrder() const override { return 3; }
 58 
 59   private:
 60 
 61     G4int fNumberOfVariables = 0;
 62 
 63     G4double* dydxTemp = nullptr;
 64     G4double* dydxTemp2 = nullptr;
 65     G4double* yTemp = nullptr;
 66     G4double* yTemp2 = nullptr;
 67 };
 68 
 69 #endif
 70