Gabriele Cosmo
73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4ImplicitEuler.hh,v 1.7 2003/11/05 16:30:55 japost Exp $
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// GEANT4 tag $Name: geant4-06-00-patch-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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