Gabriele Cosmo
76 lines
2.9 KiB
C++
76 lines
2.9 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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// $Id: G4ImplicitEuler.hh,v 1.8 2006/06/29 18:22:44 gunter Exp $
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// GEANT4 tag $Name: geant4-09-01 $
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//
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//
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// class G4ImplicitEuler
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//
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// Class description:
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//
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// Implicit Euler stepper for magnetic field:
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// x_1 = x_0 + h/2 * ( dx(t_0,x_0) + dx(t_0+h,x_0+h*dx(t_0,x_0) ) )
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//
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// Second order solver.
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// Takes the current derivative and add it to the current position.
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// Takes the output and its derivative. Adds the mean of both
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// derivatives to form the final output.
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// W. Wander <wwc@mit.edu> 12/09/97
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// -------------------------------------------------------------------
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#ifndef G4IMPLICITEULER_HH
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#define G4IMPLICITEULER_HH
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#include "G4MagErrorStepper.hh"
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class G4ImplicitEuler : public G4MagErrorStepper
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{
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public: // with description
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G4ImplicitEuler(G4EquationOfMotion *EqRhs, G4int numberOfVariables = 6) ;
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~G4ImplicitEuler();
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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 2 ; } ;
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private:
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G4double* dydxTemp;
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G4double* yTemp;
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// Temporaries, created to avoid new/delete on every call
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};
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#endif /* G4IMPLICITEULER_HH */
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