TimeStepper Class Reference

#include <TimeStepper.hpp>

Collaboration diagram for TimeStepper:

List of all members.

Public Member Functions

TimeStepper (double startTime, double endTime, double dt, bool enforceConstantTimeStep=false, std::vector< double > additionalTimes=std::vector< double >())

void AdvanceOneTimeStep ()

double GetTime () const

double GetNextTime () const

double GetNextTimeStep ()

bool IsTimeAtEnd () const

unsigned EstimateTimeSteps () const

unsigned GetTotalTimeStepsTaken () const

void ResetTimeStep (double dt)

Private Member Functions

double CalculateNextTime ()

Private Attributes

double mStart

double mEnd

double mDt

unsigned mTotalTimeStepsTaken

unsigned mAdditionalTimesReached

double mTime

double mNextTime

std::vector< double > mAdditionalTimes

Friends

class TestTimeStepper

Detailed Description

A helper class that provides a robust way to deal with time loops.

An incremented integer counter is used to calculate the current time and ensure that the correct end time.

Definition at line 41 of file TimeStepper.hpp.

Constructor & Destructor Documentation

TimeStepper::TimeStepper	(	double	startTime,
		double	endTime,
		double	dt,
		bool	enforceConstantTimeStep = `false`,
		std::vector< double >	additionalTimes = `std::vector<double> ()`
	)

Create a new time stepper over some simulation interval. Time units are not specified, but all parameters should have consistent units.

Parameters:

	startTime	the start of the interval
	endTime	the end of the interval
	dt	the time step to use.
	enforceConstantTimeStep	If this is true the stepper estimates whether non-constant timesteps will be used and quits if so.
	additionalTimes	If the timestepper needs to stop at certain additional times, they can be passed in in this std::vector. Defaults to empty. These times must be in ascending order. Note that if, for example, start=0, end=0.5, dt=0.1, and the additional stopping time is 0.33, the times used will be 0,0.1,0.2,0.3,0.33,0.4,0.5 NOT ..,0.33,0.43,0.5

Definition at line 38 of file TimeStepper.cpp.

References CalculateNextTime(), EstimateTimeSteps(), EXCEPTION, mAdditionalTimes, mDt, mEnd, mNextTime, and mStart.

Member Function Documentation

void TimeStepper::AdvanceOneTimeStep ( )

Step forward one step in time and update member variables.

Definition at line 101 of file TimeStepper.cpp.

References CalculateNextTime(), EXCEPTION, mNextTime, mTime, and mTotalTimeStepsTaken.

Referenced by AbstractOneStepIvpOdeSolver::InternalSolve(), NhsModelWithBackwardSolver::RunDoNotUpdate(), AbstractDynamicLinearPdeSolver< ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM >::Solve(), CvodeAdaptor::Solve(), AbstractOneStepIvpOdeSolver::Solve(), CardiacElectroMechanicsProblem< DIM >::Solve(), AbstractCardiacProblem< ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM >::Solve(), AbstractCvodeCell::Solve(), and AbstractBackwardEulerCardiacCell< SIZE >::SolveAndUpdateState().

double TimeStepper::GetTime ( ) const

Get the time

Definition at line 113 of file TimeStepper.cpp.

References mTime.

Referenced by AbstractOneStepIvpOdeSolver::InternalSolve(), AbstractDynamicLinearPdeSolver< ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM >::Solve(), AbstractOneStepIvpOdeSolver::Solve(), CardiacElectroMechanicsProblem< DIM >::Solve(), AbstractCardiacProblem< ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM >::Solve(), and AbstractBackwardEulerCardiacCell< SIZE >::SolveAndUpdateState().

double TimeStepper::GetNextTime ( ) const

Get the value time will take at the next step

Definition at line 118 of file TimeStepper.cpp.

References mNextTime.

Referenced by CvodeAdaptor::Solve(), AbstractOneStepIvpOdeSolver::Solve(), CardiacElectroMechanicsProblem< DIM >::Solve(), AbstractCardiacProblem< ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM >::Solve(), and AbstractCvodeCell::Solve().

double TimeStepper::GetNextTimeStep ( )

Get the size of the next time step which will be taken. GetNextTimeStep() == GetNextTime() - GetTime()

Definition at line 123 of file TimeStepper.cpp.

References mAdditionalTimes, mAdditionalTimesReached, mDt, mEnd, mNextTime, and mTime.

Referenced by AbstractOneStepIvpOdeSolver::InternalSolve(), and AbstractDynamicLinearPdeSolver< ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM >::Solve().

bool TimeStepper::IsTimeAtEnd ( ) const

True when GetTime == endTime

Definition at line 143 of file TimeStepper.cpp.

References mEnd, and mTime.

Referenced by AbstractOneStepIvpOdeSolver::InternalSolve(), NhsModelWithBackwardSolver::RunDoNotUpdate(), AbstractDynamicLinearPdeSolver< ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM >::Solve(), CvodeAdaptor::Solve(), AbstractOneStepIvpOdeSolver::Solve(), CardiacElectroMechanicsProblem< DIM >::Solve(), AbstractCardiacProblem< ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM >::Solve(), AbstractCvodeCell::Solve(), and AbstractBackwardEulerCardiacCell< SIZE >::SolveAndUpdateState().

unsigned TimeStepper::EstimateTimeSteps ( ) const

Estimate number of time steps remaining, which may be an overestimate Used to reserve memory for writing intermediate solutions.

Definition at line 148 of file TimeStepper.cpp.

References mAdditionalTimes, mDt, mEnd, and mStart.

Referenced by AbstractCardiacProblem< ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM >::DefineWriterColumns(), CvodeAdaptor::Solve(), AbstractOneStepIvpOdeSolver::Solve(), AbstractCvodeCell::Solve(), and TimeStepper().

unsigned TimeStepper::GetTotalTimeStepsTaken ( ) const

The number of time AdvanceOneTimeStep() has been called SINCE the last time ResetTimeStep() was called.

Definition at line 153 of file TimeStepper.cpp.

References mTotalTimeStepsTaken.

Referenced by CvodeAdaptor::Solve(), AbstractOneStepIvpOdeSolver::Solve(), and AbstractCvodeCell::Solve().

void TimeStepper::ResetTimeStep ( double dt )

Set the time step to use for adaptive time integration. Note that this also resets mStart to be the current time and zeroes mTotalTimeStepsTaken.

Parameters:

dt

is the new time-step

Definition at line 158 of file TimeStepper.cpp.

References CalculateNextTime(), mDt, mNextTime, mStart, mTime, and mTotalTimeStepsTaken.

Referenced by AbstractDynamicLinearPdeSolver< ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM >::Solve().

double TimeStepper::CalculateNextTime ( ) [private]

Compute what the time will be after the next time step.

Definition at line 81 of file TimeStepper.cpp.

References mAdditionalTimes, mAdditionalTimesReached, mDt, mEnd, mStart, and mTotalTimeStepsTaken.

Referenced by AdvanceOneTimeStep(), ResetTimeStep(), and TimeStepper().

Member Data Documentation

double TimeStepper::mStart [private]

The start time.

Definition at line 110 of file TimeStepper.hpp.

Referenced by CalculateNextTime(), EstimateTimeSteps(), ResetTimeStep(), and TimeStepper().

double TimeStepper::mEnd [private]

The end time.

Definition at line 113 of file TimeStepper.hpp.

Referenced by CalculateNextTime(), EstimateTimeSteps(), GetNextTimeStep(), IsTimeAtEnd(), and TimeStepper().

double TimeStepper::mDt [private]

The size of time step.

Definition at line 116 of file TimeStepper.hpp.

Referenced by CalculateNextTime(), EstimateTimeSteps(), GetNextTimeStep(), ResetTimeStep(), and TimeStepper().

unsigned TimeStepper::mTotalTimeStepsTaken [private]

The total number of time steps taken, including those to get one of the 'additional times'.

Definition at line 119 of file TimeStepper.hpp.

Referenced by AdvanceOneTimeStep(), CalculateNextTime(), GetTotalTimeStepsTaken(), and ResetTimeStep().

unsigned TimeStepper::mAdditionalTimesReached [private]

The number of times one of the 'additional times' has been passed.

Definition at line 122 of file TimeStepper.hpp.

Referenced by CalculateNextTime(), and GetNextTimeStep().

double TimeStepper::mTime [private]

The current time.

Definition at line 125 of file TimeStepper.hpp.

Referenced by AdvanceOneTimeStep(), GetNextTimeStep(), GetTime(), IsTimeAtEnd(), and ResetTimeStep().

double TimeStepper::mNextTime [private]

What the time will be after the next time step.

Definition at line 128 of file TimeStepper.hpp.

Referenced by AdvanceOneTimeStep(), GetNextTime(), GetNextTimeStep(), ResetTimeStep(), and TimeStepper().

std::vector<double> TimeStepper::mAdditionalTimes [private]

Vector to store the additional times the stepper must stop at.

Definition at line 134 of file TimeStepper.hpp.

Referenced by CalculateNextTime(), EstimateTimeSteps(), GetNextTimeStep(), and TimeStepper().

The documentation for this class was generated from the following files:

global/src/TimeStepper.hpp
global/src/TimeStepper.cpp


Public Member Functions
	TimeStepper (double startTime, double endTime, double dt, bool enforceConstantTimeStep=false, std::vector< double > additionalTimes=std::vector< double >())
void	AdvanceOneTimeStep ()
double	GetTime () const
double	GetNextTime () const
double	GetNextTimeStep ()
bool	IsTimeAtEnd () const
unsigned	EstimateTimeSteps () const
unsigned	GetTotalTimeStepsTaken () const
void	ResetTimeStep (double dt)
Private Member Functions
double	CalculateNextTime ()
Private Attributes
double	mStart
double	mEnd
double	mDt
unsigned	mTotalTimeStepsTaken
unsigned	mAdditionalTimesReached
double	mTime
double	mNextTime
std::vector< double >	mAdditionalTimes
Friends
class	TestTimeStepper