G4SimpleHeum.hh

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//
// $Id$
//
//
// class G4SimpleHeum
//
// Class description:
//
// Simple Heum stepper for magnetic field:
//        x_1 = x_0  +
//              h * 1/4 * dx(t0,x0)  +
//                  3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0)))) 
//
// Third order solver.
 
// History:
// - Created. W. Wander <[email protected]>, 12/09/97
// -------------------------------------------------------------------
 
#ifndef G4SIMPLEHEUM_HH
#define G4SIMPLEHEUM_HH
 
#include "G4MagErrorStepper.hh"
 
class G4SimpleHeum : public G4MagErrorStepper
{
 
  public:  // with description
 
    G4SimpleHeum(G4EquationOfMotion *EqRhs, G4int num_variables=6);
   ~G4SimpleHeum();
      // Constructor and destructor.
 
    void DumbStepper( const G4double y[],
                      const G4double dydx[],
                            G4double h,
                            G4double yout[]);
 
  public:  // without description
  
    G4int IntegratorOrder() const { return 3; }
 
  private:
 
    G4int fNumberOfVariables;
 
    G4double* dydxTemp  ;
    G4double* dydxTemp2 ;
    G4double* yTemp     ;
    G4double* yTemp2    ;
      // scratch space    
};
 
#endif /* G4SIMPLEHEUM_HH */