Gabriele Cosmo
127 lines
3.8 KiB
C++
127 lines
3.8 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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// Bogacki-Shampine - 4 - 3(2) non-FSAL implementation
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//
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// An implementation of the embedded RK method from the paper
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// [1] P. Bogacki and L. F. Shampine, “A 3(2) pair of Runge - Kutta formulas,”
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// Appl. Math. Lett., vol. 2, no. 4, pp. 321–325, Jan. 1989.
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//
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// This version does not utilise the FSAL property of the method,
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// which would allow the reuse of the last derivative in the next step.
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// (Alternative FSAL implementation created with revised interface)
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//
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// Implemented by Somnath Banerjee
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// Work supported by the Google Summer of Code 2015.
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// Supervision / code review: John Apostolakis
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//
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// First version: 20 May 2015
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef G4BOGACKI_SHAMPINE23_H
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#define G4BOGACKI_SHAMPINE23_H
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#include "G4MagIntegratorStepper.hh"
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class G4BogackiShampine23 : public G4MagIntegratorStepper{
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public:
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//constructor
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G4BogackiShampine23( G4EquationOfMotion *EqRhs,
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G4int numberOfVariables = 6,
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G4bool primary= true ) ;
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//destructor
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~G4BogackiShampine23() ;
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//Stepper
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void Stepper(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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G4double yerr[] ) ;
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G4double DistChord() const;
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G4int IntegratorOrder() const { return 2; }
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G4double *getLastDydx();
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private:
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G4BogackiShampine23(const G4BogackiShampine23&) = delete;
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G4BogackiShampine23& operator=(const G4BogackiShampine23&) = delete;
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private:
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G4double *ak2, *ak3, *ak4, *yTemp, *yIn;
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// for storing intermediate 'k' values in stepper
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G4double *pseudoDydx_for_DistChord;
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G4double fLastStepLength;
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G4double *fLastInitialVector, *fLastFinalVector,
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*fLastDyDx, *fMidVector, *fMidError;
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// for DistChord calculations
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G4BogackiShampine23* fAuxStepper;
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// G4int No_of_vars;
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// G4double hinit, tinit, tmax, *yinit;
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// double hmax, hmin, safe_const, err0, Step_factor;
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// void (*derivs)(double, double *, double *);
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};
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#endif /* G4BogackiShampine23 */
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