Nektar::FilterBenchmark Class Reference

Records activation and repolarisation times. More...

#include <FilterBenchmark.h>

Inheritance diagram for Nektar::FilterBenchmark:

Collaboration diagram for Nektar::FilterBenchmark:

Public Member Functions
	FilterBenchmark (const LibUtilities::SessionReaderSharedPtr &pSession, const ParamMap &pParams)
	Construct the benchmark filter. More...
virtual	~FilterBenchmark ()
	Destructor for the benchmark filter. More...
Public Member Functions inherited from Nektar::SolverUtils::Filter
SOLVER_UTILS_EXPORT	Filter (const LibUtilities::SessionReaderSharedPtr &pSession)
virtual SOLVER_UTILS_EXPORT	~Filter ()
SOLVER_UTILS_EXPORT void	Initialise (const Array< OneD, const MultiRegions::ExpListSharedPtr > &pFields, const NekDouble &time)
SOLVER_UTILS_EXPORT void	Update (const Array< OneD, const MultiRegions::ExpListSharedPtr > &pFields, const NekDouble &time)
SOLVER_UTILS_EXPORT void	Finalise (const Array< OneD, const MultiRegions::ExpListSharedPtr > &pFields, const NekDouble &time)
SOLVER_UTILS_EXPORT bool	IsTimeDependent ()

Static Public Member Functions
static SolverUtils::FilterSharedPtr	create (const LibUtilities::SessionReaderSharedPtr &pSession, const ParamMap &pParams)
	Creates an instance of this class. More...

Static Public Attributes
static std::string	className
	Name of the class. More...

Protected Member Functions
virtual void	v_Initialise (const Array< OneD, const MultiRegions::ExpListSharedPtr > &pFields, const NekDouble &time)
	Initialises the benchmark filter and allocates storage. More...
virtual void	v_Update (const Array< OneD, const MultiRegions::ExpListSharedPtr > &pFields, const NekDouble &time)
	Update recorded times. More...
virtual void	v_Finalise (const Array< OneD, const MultiRegions::ExpListSharedPtr > &pFields, const NekDouble &time)
	Finalises the benchmark filter and write out recorded data. More...
virtual bool	v_IsTimeDependent ()
	Identifies that the benchmark filter is time dependent. More...

Private Attributes
std::vector< Array< OneD, NekDouble > >	m_threshold
	Storage for activation and repolarisation times. More...
Array< OneD, int >	m_idx
	Number of activations and repolarisations detected for each point. More...
Array< OneD, int >	m_polarity
	Indicates if the previous event was an activation or repolarisation. More...
NekDouble	m_startTime
	Time at which to start detecting activations and repolarisations. More...
NekDouble	m_thresholdValue
	Value at which tissue is considered active. More...
NekDouble	m_initialValue
	Initial time to use in storage array. More...
std::string	m_outputFile
	Filename of output files. More...
LibUtilities::FieldIOSharedPtr	m_fld
	FieldIO object used for writing output files. More...

Friends
class	MemoryManager< FilterBenchmark >

Additional Inherited Members
Public Types inherited from Nektar::SolverUtils::Filter
typedef std::map< std::string, std::string >	ParamMap
Protected Attributes inherited from Nektar::SolverUtils::Filter
LibUtilities::SessionReaderSharedPtr	m_session

Detailed Description

Records activation and repolarisation times.

This class records the sequence of activation and repolarisation times across the entire domain into a two-dimensional storage structure. At each timestep, the voltage at each point in the domain is examined to identify if it has crossed the threshold value. If so, the time of crossing is recorded. Auxiliary arrays hold the current index of each point (i.e. the number of crossings of the threshold) and the type of the last crossing (activation or repolarisation).

Definition at line 45 of file FilterBenchmark.h.

Constructor & Destructor Documentation

Nektar::FilterBenchmark::FilterBenchmark	(	const LibUtilities::SessionReaderSharedPtr &	pSession,
		const ParamMap &	pParams
	)

Construct the benchmark filter.

Parameters

pSession	Session reader for IO
pParams	Parameters of filter

Definition at line 61 of file FilterBenchmark.cpp.

References Nektar::MemoryManager< DataType >::AllocateSharedPtr(), ASSERTL0, Nektar::LibUtilities::Equation::Evaluate(), m_fld, m_initialValue, m_outputFile, Nektar::SolverUtils::Filter::m_session, m_startTime, and m_thresholdValue.

    : Filter(pSession)
{
    ParamMap::const_iterator it;

    // ThresholdValue
    it = pParams.find("ThresholdValue");
    ASSERTL0(it != pParams.end(), "Missing parameter 'ThresholdValue'.");
    LibUtilities::Equation equ1(m_session, it->second);
    m_thresholdValue = floor(equ1.Evaluate());

    // InitialValue
    it = pParams.find("InitialValue");
    ASSERTL0(it != pParams.end(), "Missing parameter 'InitialValue'.");
    LibUtilities::Equation equ2(m_session, it->second);
    m_initialValue = floor(equ2.Evaluate());

    // OutputFile
    it = pParams.find("OutputFile");
    ASSERTL0(it->second.length() > 0, "Missing parameter 'OutputFile'.");
    m_outputFile = it->second;

    // StartTime
    m_startTime = 0.0;
    it = pParams.find("StartTime");
    if (it != pParams.end())
    {
        LibUtilities::Equation equ(m_session, it->second);
        m_startTime = floor(equ.Evaluate());
    }

    m_fld = MemoryManager<LibUtilities::FieldIO>::AllocateSharedPtr(
                                                        pSession->GetComm());

}

Nektar::FilterBenchmark::~FilterBenchmark ( )

virtual

Destructor for the benchmark filter.

Definition at line 103 of file FilterBenchmark.cpp.

{

}

Member Function Documentation

static SolverUtils::FilterSharedPtr Nektar::FilterBenchmark::create ( const LibUtilities::SessionReaderSharedPtr &  pSession, const ParamMap &  pParams  )

inlinestatic

Creates an instance of this class.

Definition at line 51 of file FilterBenchmark.h.

References Nektar::MemoryManager< DataType >::AllocateSharedPtr().

                                 {
        SolverUtils::FilterSharedPtr p =
            MemoryManager<FilterBenchmark>::AllocateSharedPtr(pSession,
                                                              pParams);
        return p;
    }

void Nektar::FilterBenchmark::v_Finalise ( const Array< OneD, const MultiRegions::ExpListSharedPtr > &  pFields, const NekDouble &  time  )

protectedvirtual

Finalises the benchmark filter and write out recorded data.

Writes out the crossings to file.

Parameters

pFields	Field storage expansion list.
time	Current time.

Implements Nektar::SolverUtils::Filter.

Definition at line 187 of file FilterBenchmark.cpp.

References m_fld, m_outputFile, and m_threshold.

{
    for (int i = 0; i < m_threshold.size() - 1; ++i)
    {
        std::stringstream vOutputFilename;
        vOutputFilename << m_outputFile << "_" << i << ".fld";

        std::vector<LibUtilities::FieldDefinitionsSharedPtr> FieldDef
            = pFields[0]->GetFieldDefinitions();
        std::vector<std::vector<NekDouble> > FieldData(FieldDef.size());

        Array<OneD, NekDouble> vCoeffs(pFields[0]->GetNcoeffs());
        pFields[0]->FwdTrans_IterPerExp(m_threshold[i], vCoeffs);

        // copy Data into FieldData and set variable
        for(int i = 0; i < FieldDef.size(); ++i)
        {
            // Could do a search here to find correct variable
            FieldDef[i]->m_fields.push_back("m");
            pFields[0]->AppendFieldData(FieldDef[i], FieldData[i], vCoeffs);
        }

        m_fld->Write(vOutputFilename.str(),FieldDef,FieldData);
    }
}

void Nektar::FilterBenchmark::v_Initialise ( const Array< OneD, const MultiRegions::ExpListSharedPtr > &  pFields, const NekDouble &  time  )

protectedvirtual

Initialises the benchmark filter and allocates storage.

Implements Nektar::SolverUtils::Filter.

Definition at line 114 of file FilterBenchmark.cpp.

References m_idx, m_initialValue, m_polarity, and m_threshold.

{
    m_threshold.push_back(Array<OneD, NekDouble>(
                            pFields[0]->GetNpoints(), m_initialValue));

    m_idx      = Array<OneD, int> (pFields[0]->GetNpoints(),  0);
    m_polarity = Array<OneD, int> (pFields[0]->GetNpoints(), -1);
}

bool Nektar::FilterBenchmark::v_IsTimeDependent ( )

protectedvirtual

Identifies that the benchmark filter is time dependent.

Returns

This filter is time dependent.

Implements Nektar::SolverUtils::Filter.

Definition at line 219 of file FilterBenchmark.cpp.

{
    return true;
}

void Nektar::FilterBenchmark::v_Update ( const Array< OneD, const MultiRegions::ExpListSharedPtr > &  pFields, const NekDouble &  time  )

protectedvirtual

Update recorded times.

Checks each point in the domain to determine if it has crossed the threshold. The direction of crossing is determined. Additional storage is allocated if needed.

Parameters

pFields	Field storage expansion lists
time	Current time

Implements Nektar::SolverUtils::Filter.

Definition at line 133 of file FilterBenchmark.cpp.

References m_idx, m_initialValue, m_polarity, m_startTime, m_threshold, m_thresholdValue, Nektar::LibUtilities::ReduceMax, and Vmath::Vmax().

{
    // Only proceed if the start time has passed
    if (time < m_startTime)
    {
        return;
    }

    // Examine each point in turn
    for (int i = 0; i < pFields[0]->GetNpoints(); ++i)
    {
        if ((m_polarity[i] == -1 &&
                pFields[0]->GetPhys()[i] > m_thresholdValue) ||
            (m_polarity[i] == 1 &&
                pFields[0]->GetPhys()[i] < m_thresholdValue))
        {
            // If APD less than 50ms, remove last activation
            if (m_polarity[i] == 1 &&
                time - m_threshold[m_idx[i]][i] < 50)
            {
                m_idx[i]--;
                m_threshold[m_idx[i]][i] = m_initialValue;
            }
            else
            {
                m_threshold[m_idx[i]][i] = time;
                m_idx[i]++;
            }
            // Update polarity of last crossing
            m_polarity[i] *= -1;
        }
    }

    // Allocate additional storage if any point has as many crossings as
    // current storage permits.
    int max_idx = Vmath::Vmax(pFields[0]->GetNpoints(), m_idx, 1);
    pFields[0]->GetSession()->GetComm()->AllReduce(max_idx,
                            LibUtilities::ReduceMax);
    if (m_threshold.size() == max_idx)
    {
        m_threshold.push_back(Array<OneD, NekDouble>(
                            pFields[0]->GetNpoints(), m_initialValue));
    }

}

Friends And Related Function Documentation

friend class MemoryManager< FilterBenchmark >

friend

Definition at line 48 of file FilterBenchmark.h.

Member Data Documentation

std::string Nektar::FilterBenchmark::className

static

Initial value:

=
        SolverUtils::GetFilterFactory().RegisterCreatorFunction(
                "Benchmark",
                FilterBenchmark::create)

Name of the class.

Definition at line 61 of file FilterBenchmark.h.

LibUtilities::FieldIOSharedPtr Nektar::FilterBenchmark::m_fld

private

FieldIO object used for writing output files.

Definition at line 103 of file FilterBenchmark.h.

Referenced by FilterBenchmark(), and v_Finalise().

Array<OneD, int> Nektar::FilterBenchmark::m_idx

private

Number of activations and repolarisations detected for each point.

Definition at line 91 of file FilterBenchmark.h.

Referenced by v_Initialise(), and v_Update().

NekDouble Nektar::FilterBenchmark::m_initialValue

private

Initial time to use in storage array.

Definition at line 99 of file FilterBenchmark.h.

Referenced by FilterBenchmark(), v_Initialise(), and v_Update().

std::string Nektar::FilterBenchmark::m_outputFile

private

Filename of output files.

Definition at line 101 of file FilterBenchmark.h.

Referenced by FilterBenchmark(), and v_Finalise().

Array<OneD, int> Nektar::FilterBenchmark::m_polarity

private

Indicates if the previous event was an activation or repolarisation.

Definition at line 93 of file FilterBenchmark.h.

Referenced by v_Initialise(), and v_Update().

NekDouble Nektar::FilterBenchmark::m_startTime

private

Time at which to start detecting activations and repolarisations.

Definition at line 95 of file FilterBenchmark.h.

Referenced by FilterBenchmark(), and v_Update().

std::vector<Array<OneD, NekDouble> > Nektar::FilterBenchmark::m_threshold

private

Storage for activation and repolarisation times.

Definition at line 89 of file FilterBenchmark.h.

Referenced by v_Finalise(), v_Initialise(), and v_Update().

NekDouble Nektar::FilterBenchmark::m_thresholdValue

private

Value at which tissue is considered active.

Definition at line 97 of file FilterBenchmark.h.

Referenced by FilterBenchmark(), and v_Update().