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            Last change
 on this file since 1740 was             552, checked in by ansari, 26 years ago           | 
        
        
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namespace changed to SOPHYA cmv 5/11/99 
 
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            File size:
            1.2 KB
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| 1 | // This may look like C code, but it is really -*- C++ -*-
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| 2 | #ifndef RK4CDIFEQ_H_SEEN
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| 3 | #define RK4CDIFEQ_H_SEEN
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| 4 | 
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| 5 | #include "difeq.h"
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| 6 | 
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| 7 | namespace SOPHYA {
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| 8 | 
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| 9 | // <summary> Runge-Kutta ordre 4 adaptatif </summary>
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| 10 | // Runge-Kutta ordre 4 adaptatif, avec correction du pas d'integration
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| 11 | class RK4CDiffEq : public RK4DiffEq {
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| 12 | public:
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| 13 |   // Constructeurs. Voir <linkto class=DiffEqSolver>DiffEqSolver</linkto>
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| 14 |   // <group>
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| 15 |   RK4CDiffEq();
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| 16 |   RK4CDiffEq(DiffEqFunction*);
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| 17 |   RK4CDiffEq(DIFEQFCN1);
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| 18 |   // </group>
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| 19 | 
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| 20 |   // Precision souhaitee, en absolu ou relatif, independamment pour chaque
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| 21 |   // fonction ou globalement
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| 22 |   // <group>
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| 23 |   RK4CDiffEq& Accuracy(double);
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| 24 |   RK4CDiffEq& AbsAccuracy(Vector const& vScal);
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| 25 |   RK4CDiffEq& AbsAccuracy(double scal);
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| 26 |   RK4CDiffEq& RelAccuracy();
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| 27 |   // </group>
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| 28 |   
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| 29 |   // Implementation RK4 adaptatif
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| 30 |   virtual void SolveArr(Matrix& y, double* t, double tf, int n);
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| 31 | 
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| 32 | protected:
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| 33 |   // Un pas adaptatif
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| 34 |   void RKCStep(Vector& newY, Vector const& y0, Vector const& yScale, 
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| 35 |                double dttry, double& dtdone, double& dtnext);
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| 36 | 
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| 37 |   double eps;
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| 38 |   bool   relAccuracy;
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| 39 |   Vector accScale;
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| 40 |   Vector yTemp; // Pour ne pas reallouer
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| 41 |   Vector ySave;
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| 42 | };
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| 43 | 
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| 44 | } // Fin du namespace
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| 45 | 
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| 46 | #endif
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