| 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: G4SimpleHeum.hh,v 1.8 2006/06/29 18:23:20 gunter Exp $ |
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| 28 | // GEANT4 tag $Name: $ |
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| 29 | // |
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| 30 | // |
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| 31 | // class G4SimpleHeum |
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| 32 | // |
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| 33 | // Class description: |
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| 34 | // |
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| 35 | // Simple Heum stepper for magnetic field: |
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| 36 | // x_1 = x_0 + |
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| 37 | // h * 1/4 * dx(t0,x0) + |
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| 38 | // 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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| 39 | // |
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| 40 | // Third order solver. |
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| 41 | |
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| 42 | // History: |
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| 43 | // - Created. W. Wander <wwc@mit.edu>, 12/09/97 |
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| 44 | // ------------------------------------------------------------------- |
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| 45 | |
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| 46 | #ifndef G4SIMPLEHEUM_HH |
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| 47 | #define G4SIMPLEHEUM_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 G4SimpleHeum : 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 | G4SimpleHeum(G4EquationOfMotion *EqRhs, G4int num_variables=6); |
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| 57 | ~G4SimpleHeum(); |
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| 58 | // Constructor and destructor. |
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| 59 | |
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| 60 | void DumbStepper( const G4double y[], |
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| 61 | const G4double dydx[], |
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| 62 | G4double h, |
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| 63 | G4double yout[]); |
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| 64 | |
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| 65 | public: // without description |
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| 66 | |
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| 67 | G4int IntegratorOrder() const { return 3; } |
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| 68 | |
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| 69 | private: |
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| 70 | |
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| 71 | G4int fNumberOfVariables; |
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| 72 | |
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| 73 | G4double* dydxTemp ; |
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| 74 | G4double* dydxTemp2 ; |
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| 75 | G4double* yTemp ; |
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| 76 | G4double* yTemp2 ; |
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| 77 | // scratch space |
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| 78 | }; |
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| 79 | |
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| 80 | #endif /* G4SIMPLEHEUM_HH */ |
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