Gabriele Cosmo
73 lines
2.7 KiB
C++
73 lines
2.7 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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// G4SimpleRunge
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//
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// Class description:
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//
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// Simple Runge:
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//
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// x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
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//
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// Second order solver.
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// Takes the derivative at a position to be assumed at the middle of the
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// Step and adds it to the current position.
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// Created: W.Wander <wwc@mit.edu>, 12/09/1997
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// -------------------------------------------------------------------
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#ifndef G4SIMPLERUNGE_HH
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#define G4SIMPLERUNGE_HH
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#include "G4MagErrorStepper.hh"
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class G4SimpleRunge : public G4MagErrorStepper
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{
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public: // with description
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G4SimpleRunge(G4EquationOfMotion* EquationRhs, G4int numberOfVariables = 6) ;
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~G4SimpleRunge();
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// Constructor and destructor.
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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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inline G4int IntegratorOrder() const { return 2; }
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private:
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G4int fNumberOfVariables = 0;
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G4double* dydxTemp = nullptr;
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G4double* yTemp = nullptr;
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// scratch space
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};
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#endif
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