ptolemy.domains.ct.kernel
Class CTDirector

java.lang.Object
  ptolemy.kernel.util.NamedObj
      ptolemy.kernel.util.Attribute
          ptolemy.actor.Director
              ptolemy.actor.sched.StaticSchedulingDirector
                  ptolemy.domains.ct.kernel.CTDirector

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Executable, Initializable, TimedDirector, CTGeneralDirector, Changeable, Debuggable, DebugListener, Derivable, ModelErrorHandler, MoMLExportable, Moveable, Nameable

Direct Known Subclasses:

CTMultiSolverDirector

public abstract class CTDirector
extends StaticSchedulingDirector
implements TimedDirector, CTGeneralDirector

Abstract base class for directors in the CT domain. A CTDirector has a CTScheduler which provides static schedules for firing the actors in different phases of execution in one iteration.

A CTDirector may have more than one ODE solver. In each phase of execution, one ODE solver takes charge of solving the behavior of a model. This solver is called the current ODE solver.

The continuous time (CT) domain is a timed domain. There is a global notion of time that all the actors are aware of. Time is maintained by the director. The method getModelTime() returns the current notion of model time. Time can be set by the setModelTime() method, but this method should not the called by the actors. Time can only be set by directors or their ODE solvers. Because ODE solvers can change time in their fire() methods, we need to record the beginning time of an iteration to support roll back. The _setIterationBeginTime() method is just designed for this purpose. It is called in the prefire() method of each iteration to store the beginning time, and the getIterationBeginTime() returns the lastest stored time.

This base class maintains a list of parameters that may be used by ODE solvers and actors. These parameters are:

startTime: The start time of the simulation. This parameter is effective only if the director is at the top level. The default value is 0.0.

stopTime: The stop time of the simulation. This parameter is effective only if the director is at the top level. The default value is Infinity, which results in execution that does not stop on its own.

initStepSize: The suggested integration step size by the user. This will be the step size for fixed step size ODE solvers if there is no breakpoint. However, it is just a hint. The default value is 0.1

minStepSize: The minimum step size that users want to use in the simulation. The default value is 1e-5.

maxStepSize: The maximum step size that users want to use in the simulation. Usually used to control the simulation speed. The default value is 1.0.

maxIterations: Used only in implicit ODE solvers. This is the maximum number of iterations for finding the fixed point at one time point. The default value is 20.

errorTolerance: This is the local truncation error tolerance, used for controlling the integration accuracy in variable step size ODE solvers. If the local truncation error at some step size control actors are greater than this tolerance, then the integration step is considered to have failed, and should be restarted with a reduced step size. The default value is 1e-4.

valueResolution: This is used to control the convergence of fixed point iterations. If in two successive iterations the difference of the state variables is less than this resolution, then the fixed point is considered to have reached. The default value is 1e-6.

This director maintains a breakpoint table to record all predictable breakpoints that are greater than or equal to the current time. The breakpoints are sorted in their chronological order. Breakpoints at the same time are considered to be identical, and the breakpoint table does not contain duplicate time points. A breakpoint can be inserted into the table by calling the fireAt() method. The fireAt method may be requested by the director, which inserts the stop time of the execution. The fireAt method may also be requested by actors and the requested firing time will be inserted into the breakpoint table.

Since:

Ptolemy II 0.2

Version:

$Id: CTDirector.java 57046 2010-01-27 23:35:53Z cxh $

Author:

Jie Liu, Haiyang Zheng

See Also:

Serialized Form

Accepted Rating:

Green (hyzheng)

Proposed Rating:

Green (hyzheng)

Nested Class Summary

Nested classes/interfaces inherited from class ptolemy.kernel.util.NamedObj

NamedObj.ContainedObjectsIterator

Field Summary

private TotallyOrderedSet	_breakpoints
private ODESolver	_currentSolver
private double	_currentStepSize
private boolean	_discretePhase
private double	_errorTolerance
private CTExecutionPhase	_executionPhase
private double	_initStepSize
private Time	_iterationBeginTime
private int	_maxIterations
private double	_maxStepSize
private double	_minStepSize
private java.util.Set	_prefiredActors
private Time	_startTime
private double	_startTimeValue
private Time	_stopTime
private double	_stopTimeValue
private double	_suggestedNextStepSize
protected long	_timeBase The real starting time in term of system millisecond counts.
private double	_valueResolution
Parameter	errorTolerance Error tolerance for local truncation error control, only effective in variable step size methods.
Parameter	initStepSize User's hint for the initial integration step size.
Parameter	maxIterations The maximum number of iterations in looking for a fixed point.
Parameter	maxStepSize User's guide for the maximum integration step size.
Parameter	minStepSize User's guide for the minimum integration step size.
Parameter	startTime Starting time of the simulation.
Parameter	stopTime Stop time of the simulation.
Parameter	synchronizeToRealTime Indicator whether the execution will synchronize to real time.
Parameter	valueResolution Value resolution in looking for a fixed-point state resolution.

Fields inherited from class ptolemy.actor.sched.StaticSchedulingDirector

_postfireReturns

Fields inherited from class ptolemy.actor.Director

_actorsFinishedExecution, _currentTime, _finishRequested, _initializables, _stopRequested, timeResolution

Fields inherited from class ptolemy.kernel.util.NamedObj

_changeListeners, _changeLock, _changeRequests, _debugging, _debugListeners, _elementName, _isPersistent, _verbose, _workspace, ATTRIBUTES, CLASSNAME, COMPLETE, CONTENTS, DEEP, FULLNAME, LINKS

Fields inherited from interface ptolemy.actor.Executable

COMPLETED, NOT_READY, STOP_ITERATING

Constructor Summary

CTDirector()
Construct a director in the default workspace with an empty string as its name.

CTDirector(CompositeEntity container, java.lang.String name)
Construct a director in the given container with the given name.

CTDirector(Workspace workspace)
Construct a director in the workspace with an empty name.

Method Summary

private void	_initializeLocalVariables()
protected void	_initParameters() Create and initialize all parameters to their default values.
protected ODESolver	_instantiateODESolver(java.lang.String className) Instantiate an ODESolver from its classname.
protected void	_setCurrentODESolver(ODESolver solver) Set the current ODE solver to be the given ODE solver.
protected void	_setDiscretePhase(boolean discrete) Set the current phase of execution as a discrete phase.
protected void	_setExecutionPhase(CTExecutionPhase phase) Set the execution phase to the given phase.
protected void	_setIterationBeginTime(Time time) Set the iteration begin time.
void	attributeChanged(Attribute attribute) React to a change in an attribute.
abstract boolean	canBeInsideDirector() Return true if the director can be an inside director, i.e.
abstract boolean	canBeTopLevelDirector() Return true if the director can be a top-level director.
java.lang.Object	clone(Workspace workspace) Clone the object into the specified workspace.
Dependency	delayDependency(double delay) Return a boolean dependency representing a model-time delay of the specified amount.
abstract void	fire() Override the fire() method of the super class.
Time	fireAt(Actor actor, Time time) Handle firing requests from the contained actors.
TotallyOrderedSet	getBreakPoints() Return the breakpoint table.
ODESolver	getCurrentODESolver() Return the current ODE solver used to resolve states by the director.
double	getCurrentStepSize() Return the current integration step size.
double	getErrorTolerance() Return the local truncation error tolerance, used by variable step size solvers.
CTExecutionPhase	getExecutionPhase() Get the current execution phase of this director.
double	getInitialStepSize() Return the initial step size.
Time	getIterationBeginTime() Return the begin time of the current iteration.
int	getMaxIterations() Return the maximum number of iterations in a fixed point calculation.
double	getMaxStepSize() Return the maximum step size used in variable step size ODE solvers.
double	getMinStepSize() Return the minimum step size used in variable step size ODE solvers.
Time	getModelNextIterationTime() Return the current iteration begin time plus the current step size.
Time	getModelStartTime() Return the start time.
Time	getModelStopTime() Return the stop time.
double	getSuggestedNextStepSize() Return the suggested next step size.
double	getValueResolution() Return the value resolution, used for testing if an implicit method has reached the fixed point.
void	initialize() Initialize model after type resolution.
boolean	isDiscretePhase() Return true if this is the discrete phase of execution.
Receiver	newReceiver() Return a new CTReceiver.
boolean	postfire() If the stop() method has not been called and all the actors return true at postfire, return true.
void	prefireClear() Clear the set of actors that have been prefired.
boolean	prefireDynamicActors() Invoke prefire() on all DYNAMIC_ACTORS, such as integrators, and emit their current states.
void	preinitialize() Preinitialize the model for an execution.
void	setCurrentStepSize(double stepSize) Set the current step size.
void	setSuggestedNextStepSize(double stepsize) Set the suggested next step size.
java.lang.String[]	suggestedModalModelDirectors() Return an array of suggested ModalModel directors to use with CTDirector.

Methods inherited from class ptolemy.actor.sched.StaticSchedulingDirector

_setScheduler, addDebugListener, getScheduler, invalidateSchedule, isScheduleValid, prefire, removeDebugListener, setScheduler

Methods inherited from class ptolemy.actor.Director

_description, _fireContainerAt, _isEmbedded, _isTopLevel, _transferInputs, _transferOutputs, addInitializable, createSchedule, defaultDependency, finish, fireAt, fireAtCurrentTime, getCausalityInterface, getCurrentTime, getGlobalTime, getModelTime, getNextIterationTime, getStartTime, getStopTime, getTimeResolution, implementsStrictActorSemantics, initialize, invalidateResolvedTypes, isFireFunctional, isStopRequested, isStrict, iterate, preinitialize, removeInitializable, requestInitialization, setContainer, setCurrentTime, setModelTime, stop, stopFire, supportMultirateFiring, terminate, transferInputs, transferOutputs, wrapup

Methods inherited from class ptolemy.kernel.util.Attribute

_checkContainer, _getContainedObject, _propagateExistence, getContainer, moveDown, moveToFirst, moveToIndex, moveToLast, moveUp, setName, updateContent

Methods inherited from class ptolemy.kernel.util.NamedObj

_addAttribute, _adjustOverride, _attachText, _cloneFixAttributeFields, _debug, _debug, _debug, _debug, _debug, _exportMoMLContents, _getIndentPrefix, _isMoMLSuppressed, _markContentsDerived, _propagateValue, _recordDecoratedAttributes, _removeAttribute, _splitName, _stripNumericSuffix, _validateSettables, addChangeListener, attributeList, attributeList, attributeTypeChanged, clone, containedObjectsIterator, deepContains, depthInHierarchy, description, description, event, executeChangeRequests, exportMoML, exportMoML, exportMoML, exportMoML, exportMoML, exportMoMLPlain, getAttribute, getAttribute, getAttributes, getChangeListeners, getClassName, getDecoratorAttribute, getDecoratorAttributes, getDerivedLevel, getDerivedList, getDisplayName, getElementName, getFullName, getModelErrorHandler, getName, getName, getPrototypeList, getSource, handleModelError, isDeferringChangeRequests, isOverridden, isPersistent, lazyContainedObjectsIterator, message, propagateExistence, propagateValue, propagateValues, removeChangeListener, requestChange, setClassName, setDeferringChangeRequests, setDerivedLevel, setDisplayName, setModelErrorHandler, setPersistent, setSource, sortContainedObjects, toplevel, toString, uniqueName, validateSettables, workspace

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface ptolemy.actor.TimedDirector

getModelTime, getTimeResolution

Methods inherited from interface ptolemy.domains.ct.kernel.CTGeneralDirector

getExecutiveCTGeneralDirector, getODESolverClassName

Field Detail

errorTolerance

public Parameter errorTolerance

Error tolerance for local truncation error control, only effective in variable step size methods. The default value is 1e-4, and the type is double.

initStepSize

public Parameter initStepSize

User's hint for the initial integration step size. The default value is 0.1, and the type is double.

maxIterations

public Parameter maxIterations

The maximum number of iterations in looking for a fixed point. The default value is 20, and the type is int.

maxStepSize

public Parameter maxStepSize

User's guide for the maximum integration step size. The default value is 1.0, and the type is double.

minStepSize

public Parameter minStepSize

User's guide for the minimum integration step size. The default value is 1e-5, and the type is double.

startTime

public Parameter startTime

Starting time of the simulation. The default value is 0.0, and the type is double.

stopTime

public Parameter stopTime

Stop time of the simulation. The default value is Infinity, and the type is double.

synchronizeToRealTime

public Parameter synchronizeToRealTime

Indicator whether the execution will synchronize to real time. The default value is false, and the type is boolean.

valueResolution

public Parameter valueResolution

Value resolution in looking for a fixed-point state resolution. The default value is 1e-6, and the type is double.

_timeBase

protected long _timeBase

The real starting time in term of system millisecond counts.

_breakpoints

private TotallyOrderedSet _breakpoints

_currentSolver

private ODESolver _currentSolver

_currentStepSize

private double _currentStepSize

_discretePhase

private boolean _discretePhase

_errorTolerance

private double _errorTolerance

_executionPhase

private CTExecutionPhase _executionPhase

_initStepSize

private double _initStepSize

_iterationBeginTime

private Time _iterationBeginTime

_maxIterations

private int _maxIterations

_maxStepSize

private double _maxStepSize

_minStepSize

private double _minStepSize

_prefiredActors

private java.util.Set _prefiredActors

_startTime

private Time _startTime

_startTimeValue

private double _startTimeValue

_stopTime

private Time _stopTime

_stopTimeValue

private double _stopTimeValue

_suggestedNextStepSize

private double _suggestedNextStepSize

_valueResolution

private double _valueResolution

Constructor Detail

CTDirector

public CTDirector()

Construct a director in the default workspace with an empty string as its name. The director is added to the list of objects in the workspace. Increment the version number of the workspace. All the parameters take their default values. A CTScheduler is created.

CTDirector

public CTDirector(CompositeEntity container,
                  java.lang.String name)
           throws IllegalActionException,
                  NameDuplicationException

Construct a director in the given container with the given name. The container argument must not be null, or a NullPointerException will be thrown. If the name argument is null, then the name is set to the empty string. All the parameters take their default values. A CTScheduler is created.

Parameters:

container - The container.

name - Name of this director.

Throws:

IllegalActionException - If the director is not compatible with the specified container. May be thrown by a derived class.

NameDuplicationException - If the name collides with a property in the container.

CTDirector

public CTDirector(Workspace workspace)

Construct a director in the workspace with an empty name. If the argument is null, then the default workspace will be used. The director is added to the list of objects in the workspace. Increment the version number of the workspace. All the parameters take their default values. A CTScheduler is created.

Parameters:

workspace - The workspace of this object.

Method Detail

attributeChanged

public void attributeChanged(Attribute attribute)
                      throws IllegalActionException

React to a change in an attribute. If the changed attribute matches a parameter of the director, then the corresponding local copy of the parameter value will be updated.

Overrides:

attributeChanged in class Director

Parameters:

attribute - The changed parameter.

Throws:

IllegalActionException - If the new parameter value is not valid.

canBeInsideDirector

public abstract boolean canBeInsideDirector()

Return true if the director can be an inside director, i.e. a director of an opaque composite actor not at the top level. This method is abstract in this class and derived classes need to override this to show whether it can serve as an inside director.

Returns:

True if this director can be an inside director.

canBeTopLevelDirector

public abstract boolean canBeTopLevelDirector()

Return true if the director can be a top-level director. This method is abstract in this class and derived classes need to override this to show whether it can serve as a top-level director.

Returns:

True if this director can be a top-level director.

clone

public java.lang.Object clone(Workspace workspace)
                       throws java.lang.CloneNotSupportedException

Clone the object into the specified workspace. The new object is not added to the directory of that workspace (you must do this yourself if you want it there).

Overrides:

clone in class StaticSchedulingDirector

Parameters:

workspace - The workspace for the cloned object.

Returns:

The new Attribute.

Throws:

java.lang.CloneNotSupportedException - Not thrown in this base class

See Also:

NamedObj.exportMoML(Writer, int, String), NamedObj.setDeferringChangeRequests(boolean)

delayDependency

public Dependency delayDependency(double delay)

Return a boolean dependency representing a model-time delay of the specified amount.

Specified by:

delayDependency in interface TimedDirector

Parameters:

delay - A non-negative delay.

Returns:

A boolean dependency representing a delay.

fire

public abstract void fire()
                   throws IllegalActionException

Override the fire() method of the super class. This method is abstract in this abstract base class. The derived classes need to override this method for concrete implementation.

Specified by:

fire in interface Executable

Overrides:

fire in class StaticSchedulingDirector

Throws:

IllegalActionException - If any actor executed by this actor return false in prefire.

fireAt

public Time fireAt(Actor actor,
                   Time time)
            throws IllegalActionException

Handle firing requests from the contained actors. If the specified time is earlier than the current time, or the breakpoint table is null, throw an exception. Otherwise, insert the specified time into the breakpoint table.

Overrides:

fireAt in class Director

Parameters:

actor - The actor that requests the firing.

time - The requested firing time.

Returns:

The time at which the actor passed as an argument will be fired.

Throws:

IllegalActionException - If the time is earlier than the current time, or the breakpoint table is null.

See Also:

Director.fireAtCurrentTime(Actor)

getBreakPoints

public final TotallyOrderedSet getBreakPoints()

Return the breakpoint table. The result can be null if the breakpoint table has never been created.

Returns:

The breakpoint table.

getCurrentODESolver

public final ODESolver getCurrentODESolver()

Return the current ODE solver used to resolve states by the director.

Returns:

The current ODE solver used to resolve states by the director.

getCurrentStepSize

public double getCurrentStepSize()

Return the current integration step size.

Specified by:

getCurrentStepSize in interface CTGeneralDirector

Returns:

The current integration step size.

See Also:

setCurrentStepSize(double)

getErrorTolerance

public double getErrorTolerance()

Return the local truncation error tolerance, used by variable step size solvers.

Specified by:

getErrorTolerance in interface CTGeneralDirector

Overrides:

getErrorTolerance in class Director

Returns:

The local truncation error tolerance.

getExecutionPhase

public CTExecutionPhase getExecutionPhase()

Get the current execution phase of this director. In this abstract class, always return the local execution phase. The derived classes, specially the CTEmbeddedDirector, needs to override this method.

Specified by:

getExecutionPhase in interface CTGeneralDirector

Returns:

The current execution phase of this director.

getInitialStepSize

public final double getInitialStepSize()

Return the initial step size.

Returns:

The initial step size.

getIterationBeginTime

public Time getIterationBeginTime()

Return the begin time of the current iteration.

Specified by:

getIterationBeginTime in interface CTGeneralDirector

Returns:

The begin time of the current iteration.

getMaxIterations

public final int getMaxIterations()

Return the maximum number of iterations in a fixed point calculation. If the iteration has exceeded this number and the fixed point is still not found, then the algorithm is considered to have failed.

Returns:

The maximum number of iterations when calculating fixed points.

getMaxStepSize

public final double getMaxStepSize()

Return the maximum step size used in variable step size ODE solvers.

Returns:

The maximum step size.

getMinStepSize

public final double getMinStepSize()

Return the minimum step size used in variable step size ODE solvers.

Returns:

The minimum step size.

getModelNextIterationTime

public Time getModelNextIterationTime()

Return the current iteration begin time plus the current step size.

Overrides:

getModelNextIterationTime in class Director

Returns:

The iteration begin time plus the current step size.

See Also:

Director.getModelTime()

getModelStartTime

public final Time getModelStartTime()

Return the start time.

Overrides:

getModelStartTime in class Director

Returns:

the start time.

getModelStopTime

public final Time getModelStopTime()

Return the stop time.

Overrides:

getModelStopTime in class Director

Returns:

the stop time.

getSuggestedNextStepSize

public final double getSuggestedNextStepSize()

Return the suggested next step size. The suggested step size is the minimum step size that all the step-size-control actors suggested at the end of last integration step. It is the prediction of the new step size.

Returns:

The suggested next step size.

See Also:

setSuggestedNextStepSize(double)

getValueResolution

public final double getValueResolution()

Return the value resolution, used for testing if an implicit method has reached the fixed point. Two values that are differed less than this accuracy are considered identical in the fixed-point calculation.

Returns:

The value resolution for finding fixed point.

initialize

public void initialize()
                throws IllegalActionException

Initialize model after type resolution. In addition to calling the initialize() method of the super class, this method records the current system time as the "real" starting time of the execution. This starting time is used when the execution is synchronized to real time. This method also resets the protected variables of this director.

Specified by:

initialize in interface Initializable

Overrides:

initialize in class Director

Throws:

IllegalActionException - If the super class throws it.

isDiscretePhase

public boolean isDiscretePhase()

Return true if this is the discrete phase of execution.

Specified by:

isDiscretePhase in interface CTGeneralDirector

Returns:

True if this is the discrete phase of execution.

newReceiver

public Receiver newReceiver()

Return a new CTReceiver.

Overrides:

newReceiver in class Director

Returns:

A new CTReceiver.

postfire

public boolean postfire()
                 throws IllegalActionException

If the stop() method has not been called and all the actors return true at postfire, return true. Otherwise, return false. If this director is not at the top level and the breakpoint table is not empty, request a refiring at the first breakpoint.

Specified by:

postfire in interface Executable

Overrides:

postfire in class StaticSchedulingDirector

Returns:

True if the Director wants to be fired again in the future.

Throws:

IllegalActionException - If refiring can not be granted.

prefireClear

public void prefireClear()

Clear the set of actors that have been prefired.

prefireDynamicActors

public boolean prefireDynamicActors()
                             throws IllegalActionException

Invoke prefire() on all DYNAMIC_ACTORS, such as integrators, and emit their current states. Return true if all the prefire() methods return true and stop() is not called. Otherwise, return false.

Returns:

True if all dynamic actors return true from their prefire() methods and stop() is called.

Throws:

IllegalActionException - If scheduler throws it, or dynamic actors throw it in their prefire() method, or they can not be prefired.

preinitialize

public void preinitialize()
                   throws IllegalActionException

Preinitialize the model for an execution. This method is called only once for each simulation. The schedule is invalidated, statistical variables and the breakpoint table are cleared, all actors are preinitialized. If this director does not have a container and a scheduler, or the director does not fit in this level of hierarchy, an IllegalActionException will be thrown.

Note, however, time does not have a meaning when actors are preinitialized. So actors must not use a notion of time in their preinitialize() methods.

Specified by:

preinitialize in interface Initializable

Overrides:

preinitialize in class Director

Throws:

IllegalActionException - If this director has no container, or this director does not fit this level of hierarchy, or there is no scheduler.

setCurrentStepSize

public void setCurrentStepSize(double stepSize)

Set the current step size. Only CT directors can call this method. Solvers and actors must not call this method.

Parameters:

stepSize - The step size to be set.

See Also:

getCurrentStepSize()

setSuggestedNextStepSize

public void setSuggestedNextStepSize(double stepsize)

Set the suggested next step size. If the argument is larger than the maximum step size, then set the suggested next step size to the maximum step size.

Parameters:

stepsize - The suggested next step size.

See Also:

getSuggestedNextStepSize()

suggestedModalModelDirectors

public java.lang.String[] suggestedModalModelDirectors()

Return an array of suggested ModalModel directors to use with CTDirector. The default director is HSFSMDirector, which is used in hybrid system. FSMDirector could also be used with CTDirector in some simple cases.

Overrides:

suggestedModalModelDirectors in class Director

Returns:

An array of suggested directors to be used with ModalModel.

See Also:

Director.suggestedModalModelDirectors()

_initParameters

protected void _initParameters()

Create and initialize all parameters to their default values. This is called by the constructor.

_instantiateODESolver

protected final ODESolver _instantiateODESolver(java.lang.String className)
                                         throws IllegalActionException

Instantiate an ODESolver from its classname. Given the solver's full class name, this method will try to instantiate it by looking for the corresponding java class.

Parameters:

className - The solver's full class name.

Returns:

a new ODE solver.

Throws:

IllegalActionException - If the solver can not be created.

_setCurrentODESolver

protected final void _setCurrentODESolver(ODESolver solver)
                                   throws IllegalActionException

Set the current ODE solver to be the given ODE solver.

Parameters:

solver - The solver to set.

Throws:

IllegalActionException - Not thrown in this base class. It may be thrown by the derived classes if the solver is not appropriate.

_setDiscretePhase

protected final void _setDiscretePhase(boolean discrete)

Set the current phase of execution as a discrete phase. The value set can be returned by the isDiscretePhase() method.

Parameters:

discrete - True if this is the discrete phase.

_setExecutionPhase

protected final void _setExecutionPhase(CTExecutionPhase phase)

Set the execution phase to the given phase.

Parameters:

phase - The current phase of the CT director.

_setIterationBeginTime

protected final void _setIterationBeginTime(Time time)

Set the iteration begin time. The iteration begin time is the start time for one integration step. This variable is used when the integration step is failed, and need to be restarted with another step size.

Parameters:

time - The iteration begin time.

_initializeLocalVariables

private void _initializeLocalVariables()
                                throws IllegalActionException

Throws:

IllegalActionException