CvodeAdaptor.cpp

/*

Copyright (C) University of Oxford, 2005-2011

University of Oxford means the Chancellor, Masters and Scholars of the
University of Oxford, having an administrative office at Wellington
Square, Oxford OX1 2JD, UK.

This file is part of Chaste.

Chaste is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 2.1 of the License, or
(at your option) any later version.

Chaste is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details. The offer of Chaste under the terms of the
License is subject to the License being interpreted in accordance with
English Law and subject to any action against the University of Oxford
being under the jurisdiction of the English Courts.

You should have received a copy of the GNU Lesser General Public License
along with Chaste. If not, see <http://www.gnu.org/licenses/>.

*/

#ifdef CHASTE_CVODE

#include "CvodeAdaptor.hpp"

#include "Exception.hpp"
#include "TimeStepper.hpp"
#include "VectorHelperFunctions.hpp"

#include <iostream>
#include <sstream>

// CVODE headers
#include <sundials/sundials_nvector.h>
#include <cvode/cvode_dense.h>


int CvodeRhsAdaptor(realtype t, N_Vector y, N_Vector ydot, void* pData)
{
    assert(pData != NULL);
    CvodeData* p_data = (CvodeData*) pData;
    // Get y, ydot into std::vector<>s
    static std::vector<realtype> ydot_vec;
    CopyToStdVector(y, *p_data->pY);
    CopyToStdVector(ydot, ydot_vec);
    // Call our function
    try
    {
        p_data->pSystem->EvaluateYDerivatives(t, *(p_data->pY), ydot_vec);
    }
    catch (const Exception &e)
    {
        std::cerr << "CVODE RHS Exception: " << e.GetMessage() << std::endl << std::flush;
        return -1;
    }
    // Copy derivative back
    CopyFromStdVector(ydot_vec, ydot);
    return 0;
}

int CvodeRootAdaptor(realtype t, N_Vector y, realtype* pGOut, void* pData)
{
    assert(pData != NULL);
    CvodeData* p_data = (CvodeData*) pData;
    // Get y into a std::vector
    CopyToStdVector(y, *p_data->pY);
    // Call our function
    try
    {
        *pGOut = p_data->pSystem->CalculateRootFunction(t, *p_data->pY);
    }
    catch (const Exception &e)
    {
        std::cerr << "CVODE Root Exception: " << e.GetMessage() << std::endl << std::flush;
        return -1;
    }
    return 0;
}

// /**
//  * Jacobian computation adaptor function.
//  *
//  * If solving an AbstractOdeSystemWithAnalyticJacobian, this function
//  * can be used to allow CVODE to compute the Jacobian analytically.
//  *
//  * Note to self: can test using pSystem->GetUseAnalyticJacobian().
//  */
// int CvodeDenseJacobianAdaptor(long int numberOfStateVariables, DenseMat J,
//                               realtype t, N_Vector y, N_Vector fy,
//                               void* pData,
//                               N_Vector tmp1, N_Vector tmp2, N_Vector tmp3)
// {
//     AbstractOdeSystemWithAnalyticJacobian* pSystem
//         = (AbstractOdeSystemWithAnalyticJacobian*) pData;
//     // Get the current time step
//     double dt;
//     CVodeGetCurrentStep(CvodeMem, &dt);
//     // Get std::vector<> for y and double** for J
//     std::vector<realtype>& y_vec = *NV_DATA_STL(y);
//     double** ppJ = J->data; // organised column-wise: J_{i,j} = ppJ[j][i]
//     // Call our function
//     try
//     {
//         pSystem->AnalyticJacobian(y_vec, ppJ, t, dt);
//     }
//     catch (const Exception &e)
//     {
//         std::cerr << "CVODE J Exception: " << e.GetMessage() << std::endl << std::flush;
//         return -1;
//     }
//     // Update J (if needed)
//     return 0;
// }



void CvodeErrorHandler(int errorCode, const char *module, const char *function,
                       char *message, void* pData)
{
    std::stringstream err;
    err << "CVODE Error " << errorCode << " in module " << module
        << " function " << function << ": " << message;
    std::cerr << "*" << err.str() << std::endl << std::flush;
    // Throwing the exception here causes termination on Maverick (g++ 4.4)
    //EXCEPTION(err.str());
}



void CvodeAdaptor::SetupCvode(AbstractOdeSystem* pOdeSystem,
                              std::vector<double>& rInitialY,
                              double startTime, double maxStep)
{
    assert(rInitialY.size() == pOdeSystem->GetNumberOfStateVariables());
    assert(maxStep > 0.0);

    mInitialValues = N_VMake_Serial(rInitialY.size(), &(rInitialY[0]));
    assert(NV_DATA_S(mInitialValues) == &(rInitialY[0]));
    assert(!NV_OWN_DATA_S(mInitialValues));
//    std::cout << " Initial values: "; N_VPrint_Serial(mInitialValues);
//    std::cout << " Rtol: " << mRelTol << ", Atol: " << mAbsTol << std::endl;
//    std::cout << " Start: " << startTime << " max dt=" << maxStep << std::endl << std::flush;

    mpCvodeMem = CVodeCreate(CV_BDF, CV_NEWTON);
    if (mpCvodeMem == NULL) EXCEPTION("Failed to SetupCvode CVODE");
    // Set error handler
    CVodeSetErrHandlerFn(mpCvodeMem, CvodeErrorHandler, NULL);
    // Set the user data
    mData.pSystem = pOdeSystem;
    mData.pY = &rInitialY;
#if CHASTE_SUNDIALS_VERSION >= 20400
    CVodeSetUserData(mpCvodeMem, (void*)(&mData));
#else
    CVodeSetFdata(mpCvodeMem, (void*)(&mData));
#endif
    // Setup CVODE
#if CHASTE_SUNDIALS_VERSION >= 20400
    CVodeInit(mpCvodeMem, CvodeRhsAdaptor, startTime, mInitialValues); 
    CVodeSStolerances(mpCvodeMem, mRelTol, mAbsTol);
#else
    CVodeMalloc(mpCvodeMem, CvodeRhsAdaptor, startTime, mInitialValues,
                CV_SS, mRelTol, &mAbsTol);
#endif
    CVodeSetMaxStep(mpCvodeMem, maxStep);
    // Set the rootfinder function if wanted
    if (mCheckForRoots)
    {
#if CHASTE_SUNDIALS_VERSION >= 20400
        CVodeRootInit(mpCvodeMem, 1, CvodeRootAdaptor);
#else
        CVodeRootInit(mpCvodeMem, 1, CvodeRootAdaptor, (void*)(&mData));
#endif
    }
    // Change max steps if wanted
    if (mMaxSteps > 0)
    {
        CVodeSetMaxNumSteps(mpCvodeMem, mMaxSteps);
    }
    // Attach a linear solver for Newton iteration
    CVDense(mpCvodeMem, rInitialY.size());
}

void CvodeAdaptor::FreeCvodeMemory()
{
//    assert(!NV_OWN_DATA_STL(mInitialValues));
//    std::vector<double>* pVec = NV_DATA_STL(mInitialValues);
//    double val = (*pVec)[0];
    N_VDestroy_Serial(mInitialValues); mInitialValues = NULL;
//    std::cout << "  a: " << val << ", b: " << (*pVec)[0] << std::endl;

    CVodeFree(&mpCvodeMem);
}


void CvodeAdaptor::CvodeError(int flag, const char * msg)
{
    std::stringstream err;
    char* p_flag_name = CVodeGetReturnFlagName(flag);
    err << msg << ": " << p_flag_name;
    free(p_flag_name);
    std::cerr << err.str() << std::endl << std::flush;
    EXCEPTION(err.str());
}


OdeSolution CvodeAdaptor::Solve(AbstractOdeSystem* pOdeSystem,
                                std::vector<double>& rYValues,
                                double startTime,
                                double endTime,
                                double maxStep,
                                double timeSampling)
{
    assert(endTime > startTime);
    assert(timeSampling > 0.0);

    mStoppingEventOccurred = false;
    if (mCheckForRoots && pOdeSystem->CalculateStoppingEvent(startTime, rYValues) == true)
    {
        EXCEPTION("(Solve with sampling) Stopping event is true for initial condition");
    }

    SetupCvode(pOdeSystem, rYValues, startTime, maxStep);

    TimeStepper stepper(startTime, endTime, timeSampling);
    N_Vector yout = mInitialValues;

    // Set up ODE solution
    OdeSolution solutions;
    solutions.SetNumberOfTimeSteps(stepper.EstimateTimeSteps());
    solutions.rGetSolutions().push_back(rYValues);
    solutions.rGetTimes().push_back(startTime);
    solutions.SetOdeSystemInformation(pOdeSystem->GetSystemInformation());

    // Main time sampling loop
    while (!stepper.IsTimeAtEnd() && !mStoppingEventOccurred)
    {
        double tend;
        int ierr = CVode(mpCvodeMem, stepper.GetNextTime(), yout, &tend, CV_NORMAL);
        if (ierr<0)
        {
            FreeCvodeMemory();
            CvodeError(ierr, "CVODE failed to solve system");
        }
        // Store solution
        solutions.rGetSolutions().push_back(rYValues);
        solutions.rGetTimes().push_back(tend);
        if (ierr == CV_ROOT_RETURN)
        {
            // Stopping event occurred
            mStoppingEventOccurred = true;
            mStoppingTime = tend;
        }
        stepper.AdvanceOneTimeStep();
    }

    // stepper.EstimateTimeSteps may have been an overestimate...
    solutions.SetNumberOfTimeSteps(stepper.GetTotalTimeStepsTaken());

    int ierr = CVodeGetLastStep(mpCvodeMem, &mLastInternalStepSize);
    assert(ierr == CV_SUCCESS); ierr=ierr; // avoid unused var warning
    FreeCvodeMemory();

    return solutions;
}


void CvodeAdaptor::Solve(AbstractOdeSystem* pOdeSystem,
                         std::vector<double>& rYValues,
                         double startTime,
                         double endTime,
                         double maxStep)
{
    assert(endTime > startTime);

    mStoppingEventOccurred = false;
    if (mCheckForRoots && pOdeSystem->CalculateStoppingEvent(startTime, rYValues) == true)
    {
        EXCEPTION("(Solve) Stopping event is true for initial condition");
    }

    SetupCvode(pOdeSystem, rYValues, startTime, maxStep);

    N_Vector yout = mInitialValues;
    double tend;
    int ierr = CVode(mpCvodeMem, endTime, yout, &tend, CV_NORMAL);
    if (ierr<0)
    {
        FreeCvodeMemory();
        CvodeError(ierr, "CVODE failed to solve system");
    }
    if (ierr == CV_ROOT_RETURN)
    {
        // Stopping event occurred
        mStoppingEventOccurred = true;
        mStoppingTime = tend;
    }
    assert(NV_DATA_S(yout) == &(rYValues[0]));
    assert(!NV_OWN_DATA_S(yout));

//    long int steps;
//    CVodeGetNumSteps(mpCvodeMem, &steps);
//    std::cout << " Solved to " << endTime << " in " << steps << " steps.\n";

    ierr = CVodeGetLastStep(mpCvodeMem, &mLastInternalStepSize);
    assert(ierr == CV_SUCCESS); ierr=ierr; // avoid unused var warning
    FreeCvodeMemory();
}

CvodeAdaptor::CvodeAdaptor(double relTol, double absTol)
    : AbstractIvpOdeSolver(),
      mpCvodeMem(NULL), mInitialValues(NULL),
      mRelTol(relTol), mAbsTol(absTol),
      mLastInternalStepSize(-0.0),
      mMaxSteps(0),
      mCheckForRoots(false)
{
}

void CvodeAdaptor::SetTolerances(double relTol, double absTol)
{
    mRelTol = relTol;
    mAbsTol = absTol;
}

double CvodeAdaptor::GetRelativeTolerance()
{
    return mRelTol;
}

double CvodeAdaptor::GetAbsoluteTolerance()
{
    return mAbsTol;
}

double CvodeAdaptor::GetLastStepSize()
{
    return mLastInternalStepSize;
}

void CvodeAdaptor::CheckForStoppingEvents()
{
    mCheckForRoots = true;
}

void CvodeAdaptor::SetMaxSteps(long int numSteps)
{
    mMaxSteps = numSteps;
}

long int CvodeAdaptor::GetMaxSteps()
{
    return mMaxSteps;
}

// Serialization for Boost >= 1.36
#include "SerializationExportWrapperForCpp.hpp"
CHASTE_CLASS_EXPORT(CvodeAdaptor)

#endif // CHASTE_CVODE

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