Gabriele Cosmo
79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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//
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//
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// class G4SimpleHeum
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//
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// Class description:
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//
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// Simple Heum stepper for magnetic field:
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// x_1 = x_0 +
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// h * 1/4 * dx(t0,x0) +
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// 3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0))))
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//
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// Third order solver.
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// History:
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// - Created. W. Wander <wwc@mit.edu>, 12/09/97
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// -------------------------------------------------------------------
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#ifndef G4SIMPLEHEUM_HH
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#define G4SIMPLEHEUM_HH
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#include "G4MagErrorStepper.hh"
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class G4SimpleHeum : public G4MagErrorStepper
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{
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public: // with description
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G4SimpleHeum(G4EquationOfMotion *EqRhs, G4int num_variables=6);
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~G4SimpleHeum();
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// Constructor and destructor.
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void DumbStepper( const G4double y[],
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const G4double dydx[],
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G4double h,
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G4double yout[]);
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public: // without description
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G4int IntegratorOrder() const { return 3; }
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private:
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G4int fNumberOfVariables;
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G4double* dydxTemp ;
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G4double* dydxTemp2 ;
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G4double* yTemp ;
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G4double* yTemp2 ;
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// scratch space
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};
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#endif /* G4SIMPLEHEUM_HH */
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