SteadyStateRunner.cpp

/*

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*/

#include "SteadyStateRunner.hpp"

#ifdef CHASTE_CVODE

void SteadyStateRunner::RunToSteadyStateImplementation()
{
    // Get necessary things from stimulus current
    boost::shared_ptr<RegularStimulus> p_reg_stim =
                         boost::static_pointer_cast<RegularStimulus>(mpModel->GetStimulusFunction());
    const double pacing_cycle_length = p_reg_stim->GetPeriod(); //ms
    double maximum_time_step = p_reg_stim->GetDuration();  // ms

    // Set up vectors to monitor progress
    std::vector<double> old_state_vars;
    std::vector<double> new_state_vars;
    CopyToStdVector(mpModel->rGetStateVariables(),old_state_vars);

    mpModel->SetMaxSteps(1e5); // Per pace.

    /*
     * This was an idea about solving roughly to start with and then refining later,
     * but it overrides anything set by the user and is therefore a bit dangerous.
     * It also didn't seem to make very much difference...
     */
    //bool rough_solution = true;
    //mpModel->SetTolerances(1e-4,1e-6);

    // Use optimisations from #1912 - since we don't interfere with the model between Solve() calls don't reset.
    mpModel->SetMinimalReset(true);

    const unsigned num_paces_to_analyse = (mTwoPaceScan) ? 2u : 1u;

    for (unsigned i=0; i<mMaxNumPaces; i=i+num_paces_to_analyse)
    {
        // Look at two paces in the hope of detecting alternans and still saying we're steady-ish.
        mpModel->Solve((pacing_cycle_length)*(double)(i), (pacing_cycle_length)*(double)(i+num_paces_to_analyse), maximum_time_step);
        this->mNumEvaluations += num_paces_to_analyse;
        CopyToStdVector(mpModel->rGetStateVariables(),new_state_vars);

        // Calculate the change in the norm of the state variables
        double temp = 0;
        for (unsigned j=0; j<old_state_vars.size(); j++)
        {
            temp += fabs(new_state_vars[j] - old_state_vars[j]);
        }

//        if (rough_solution && temp < 1e-4)
//        {
//            mpModel->SetTolerances(1e-6,1e-8);
//            rough_solution = false;
//        }

        if (temp < 1e-6)
        {
            break;
        }

        old_state_vars = new_state_vars;
    }

    // Since we don't know what we are going to do with it next re-set it on every solve call.
    mpModel->SetMinimalReset(false);
}

#endif // CHASTE_CVODE