BackwardEulerIvpOdeSolver.hpp

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*/

#ifndef BACKWARDEULERIVPODESOLVER_HPP_
#define BACKWARDEULERIVPODESOLVER_HPP_

#include "AbstractOneStepIvpOdeSolver.hpp"
#include "AbstractOdeSystemWithAnalyticJacobian.hpp"

#include "ChasteSerialization.hpp"
#include <boost/serialization/base_object.hpp>

#include "AbstractOneStepIvpOdeSolver.hpp"

class BackwardEulerIvpOdeSolver  : public AbstractOneStepIvpOdeSolver
{
private:
    friend class boost::serialization::access;
    template<class Archive>
    void serialize(Archive & archive, const unsigned int version)
    {
        // This calls serialize on the base class.
        archive & boost::serialization::base_object<AbstractOneStepIvpOdeSolver>(*this);
        //archive & mSizeOfOdeSystem; - this done in save and load construct now.
        archive & mNumericalJacobianEpsilon;
        archive & mForceUseOfNumericalJacobian;
    }

    unsigned mSizeOfOdeSystem;

    double mNumericalJacobianEpsilon;

    bool mForceUseOfNumericalJacobian;

    /*
     * NOTE: we use (unsafe) double pointers here rather than
     * std::vectors because using std::vectors would lead to a
     * slow down by a factor of about 4.
     */

    double* mResidual;

    double** mJacobian;

    double* mUpdate;

    void ComputeResidual(AbstractOdeSystem* pAbstractOdeSystem,
                         double timeStep,
                         double time,
                         std::vector<double>& rCurrentYValues,
                         std::vector<double>& rCurrentGuess);

    void ComputeJacobian(AbstractOdeSystem* pAbstractOdeSystem,
                         double timeStep,
                         double time,
                         std::vector<double>& rCurrentYValues,
                         std::vector<double>& rCurrentGuess);

    void SolveLinearSystem();

    double ComputeNorm(double* pVector);

    void ComputeNumericalJacobian(AbstractOdeSystem* pAbstractOdeSystem,
                                  double timeStep,
                                  double time,
                                  std::vector<double>& rCurrentYValues,
                                  std::vector<double>& rCurrentGuess);

protected:

    void CalculateNextYValue(AbstractOdeSystem* pAbstractOdeSystem,
                             double timeStep,
                             double time,
                             std::vector<double>& rCurrentYValues,
                             std::vector<double>& rNextYValues);

public:

    BackwardEulerIvpOdeSolver(unsigned sizeOfOdeSystem);

    ~BackwardEulerIvpOdeSolver();

    void SetEpsilonForNumericalJacobian(double epsilon);

    void ForceUseOfNumericalJacobian();

     unsigned GetSystemSize() const {return mSizeOfOdeSystem;};
};

#include "SerializationExportWrapper.hpp"
CHASTE_CLASS_EXPORT(BackwardEulerIvpOdeSolver)

namespace boost
{
namespace serialization
{
template<class Archive>
inline void save_construct_data(
    Archive & ar, const BackwardEulerIvpOdeSolver * t, const unsigned int file_version)
{
    const unsigned system_size = t->GetSystemSize();
    ar & system_size;
}

template<class Archive>
inline void load_construct_data(
    Archive & ar, BackwardEulerIvpOdeSolver * t, const unsigned int file_version)
{
     unsigned ode_system_size;
     ar >> ode_system_size;
     ::new(t)BackwardEulerIvpOdeSolver(ode_system_size);
}
}
} // namespace ...

#endif /*BACKWARDEULERIVPODESOLVER_HPP_*/