ptolemy.domains.ct.kernel.solver
Class ForwardEulerSolver

java.lang.Object
  ptolemy.kernel.util.NamedObj
      ptolemy.domains.ct.kernel.ODESolver
          ptolemy.domains.ct.kernel.solver.FixedStepSolver
              ptolemy.domains.ct.kernel.solver.ForwardEulerSolver

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Changeable, Debuggable, DebugListener, Derivable, ModelErrorHandler, MoMLExportable, Moveable, Nameable

public class ForwardEulerSolver
extends FixedStepSolver

The Forward Euler ODE solver. For ODE

 dx/dt = f(x, u, t), x(0) = x0;
 

The Forward Euler method approximates the x(t+h) as:

 x(t+h) =  x(t) + h * f(x(t), u(t), t)
 

No error control and step size control is performed. This is the simplest algorithm for solving an ODE. It is a first order method, and has stability problem for some systems.

Since:

Ptolemy II 0.2

Version:

$Id: ForwardEulerSolver.java 57040 2010-01-27 20:52:32Z 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 static java.lang.String

_DEFAULT_NAME

Fields inherited from class ptolemy.kernel.util.NamedObj

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

Constructor Summary

ForwardEulerSolver()
Construct a solver in the default workspace with an empty string as name.

ForwardEulerSolver(Workspace workspace)
Construct a solver in the given workspace.

Method Summary

void	integratorFire(CTBaseIntegrator integrator) Fire the integrator to resolve states.

Methods inherited from class ptolemy.domains.ct.kernel.solver.FixedStepSolver

_advanceModelTime, fireDynamicActors, fireStateTransitionActors, getAmountOfHistoryInformation, getIntegratorAuxVariableCount, integratorIsAccurate, integratorPredictedStepSize

Methods inherited from class ptolemy.domains.ct.kernel.ODESolver

_getRoundCount, _getSchedule, _incrementRoundCount, _isConverged, _makeSolverOf, _resetRoundCount, _setConverged, _voteForConverged, getContainer, resolveStates

Methods inherited from class ptolemy.kernel.util.NamedObj

_addAttribute, _adjustOverride, _attachText, _cloneFixAttributeFields, _debug, _debug, _debug, _debug, _debug, _description, _exportMoMLContents, _getContainedObject, _getIndentPrefix, _isMoMLSuppressed, _markContentsDerived, _propagateExistence, _propagateValue, _recordDecoratedAttributes, _removeAttribute, _splitName, _stripNumericSuffix, _validateSettables, addChangeListener, addDebugListener, attributeChanged, attributeList, attributeList, attributeTypeChanged, clone, 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, moveDown, moveToFirst, moveToIndex, moveToLast, moveUp, propagateExistence, propagateValue, propagateValues, removeChangeListener, removeDebugListener, requestChange, setClassName, setDeferringChangeRequests, setDerivedLevel, setDisplayName, setModelErrorHandler, setName, setPersistent, setSource, sortContainedObjects, toplevel, toString, uniqueName, validateSettables, workspace

Methods inherited from class java.lang.Object

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

Field Detail

_DEFAULT_NAME

private static final java.lang.String _DEFAULT_NAME

See Also:

Constant Field Values

Constructor Detail

ForwardEulerSolver

public ForwardEulerSolver()

Construct a solver in the default workspace with an empty string as name. The solver is added to the list of objects in the workspace. Increment the version number of the workspace. The name of the solver is set to "CT_Forward_Euler_Solver".

ForwardEulerSolver

public ForwardEulerSolver(Workspace workspace)

Construct a solver in the given workspace. If the workspace argument is null, use the default workspace. The director is added to the list of objects in the workspace. The name of the solver is set to "CT_Forward_Euler_Solver". Increment the version number of the workspace.

Parameters:

workspace - Object for synchronization and version tracking

Method Detail

integratorFire

public void integratorFire(CTBaseIntegrator integrator)
                    throws IllegalActionException

Fire the integrator to resolve states.

Specified by:

integratorFire in class ODESolver

Parameters:

integrator - The integrator to be fired.

Throws:

IllegalActionException - If there is no director, or can not read input, or can not send output.