| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // $Id: G4ImplicitEuler.hh,v 1.8 2006/06/29 18:22:44 gunter Exp $
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| 28 | // GEANT4 tag $Name: geant4-09-02-cand-01 $
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| 29 | //
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| 30 | //
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| 31 | // class G4ImplicitEuler
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| 32 | //
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| 33 | // Class description:
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| 34 | //
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| 35 | // Implicit Euler stepper for magnetic field:
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| 36 | // 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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| 37 | //
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| 38 | // Second order solver.
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| 39 | // Takes the current derivative and add it to the current position.
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| 40 | // Takes the output and its derivative. Adds the mean of both
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| 41 | // derivatives to form the final output.
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| 42 |
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| 43 | // W. Wander <wwc@mit.edu> 12/09/97
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| 44 | // -------------------------------------------------------------------
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| 45 |
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| 46 | #ifndef G4IMPLICITEULER_HH
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| 47 | #define G4IMPLICITEULER_HH
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| 48 |
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| 49 | #include "G4MagErrorStepper.hh"
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| 50 |
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| 51 | class G4ImplicitEuler : public G4MagErrorStepper
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| 52 | {
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| 53 |
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| 54 | public: // with description
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| 55 |
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| 56 | G4ImplicitEuler(G4EquationOfMotion *EqRhs, G4int numberOfVariables = 6) ;
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| 57 | ~G4ImplicitEuler();
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| 58 |
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| 59 | void DumbStepper( const G4double y[] ,
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| 60 | const G4double dydx[] ,
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| 61 | G4double h ,
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| 62 | G4double yout[] ) ;
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| 63 |
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| 64 | public: // without description
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| 65 |
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| 66 | G4int IntegratorOrder() const { return 2 ; } ;
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| 67 |
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| 68 | private:
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| 69 |
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| 70 | G4double* dydxTemp;
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| 71 | G4double* yTemp;
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| 72 | // Temporaries, created to avoid new/delete on every call
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| 73 | };
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| 74 |
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| 75 | #endif /* G4IMPLICITEULER_HH */
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