Gabriele Cosmo
61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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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 statement,
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// and all its terms.
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//
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// $Id: G4SimpleRunge.hh,v 1.4 2000/11/01 15:15:51 gcosmo Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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//
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//
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// class 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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// Take the derivative at a position to be assumed at the middle of the
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// Step and add it to the current position.
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// History:
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// - Created. W.Wander <wwc@mit.edu>, 12/09/97
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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(G4Mag_EqRhs *EqRhs, 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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G4int IntegratorOrder() const { return 2; }
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private:
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G4int fNumberOfVariables ;
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G4double* dydxTemp;
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G4double* dydxTemp2;
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G4double* yTemp;
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// scratch space
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};
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#endif /* G4SIMPLERUNGE_HH */
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