ptolemy.actor.lib.colt
Class ColtBeta

java.lang.Object
  ptolemy.kernel.util.NamedObj
      ptolemy.kernel.InstantiableNamedObj
          ptolemy.kernel.Entity
              ptolemy.kernel.ComponentEntity
                  ptolemy.actor.AtomicActor
                      ptolemy.actor.TypedAtomicActor
                          ptolemy.actor.lib.Source
                              ptolemy.actor.lib.RandomSource
                                  ptolemy.actor.lib.colt.ColtRandomSource
                                      ptolemy.actor.lib.colt.ColtBeta

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Actor, Executable, FiringsRecordable, Initializable, TypedActor, Changeable, Debuggable, DebugListener, Derivable, Instantiable, ModelErrorHandler, MoMLExportable, Moveable, Nameable

public class ColtBeta
extends ColtRandomSource

Produce a random sequence with a Beta distribution. On each iteration, a new random number is produced. The output port is of type DoubleToken. The values that are generated are independent and identically distributed with the mean and the standard deviation given by parameters. In addition, the seed can be specified as a parameter to control the sequence that is generated.

This actor instantiates a cern.jet.random.Beta object with alpha and beta both set to 2.0.

A definition of NegativeBinomial by Wolfgang Hoschek can be found at http://hoschek.home.cern.ch/hoschek/colt/V1.0.3/doc/cern/jet/stat/Probability.html#beta(double,%20double,%20double):

beta

public static double beta(double a,
 double b,
 double x)

Returns the area from zero to x under the beta density function.

                          x
            -             -
           | (a+b)       | |  a-1      b-1
 P(x)  =  ----------     |   t    (1-t)    dt
           -     -     | |
          | (a) | (b)   -
                         0
 

This function is identical to the incomplete beta integral function Gamma.incompleteBeta(a, b, x). The complemented function is 1 - P(1-x) = Gamma.incompleteBeta( b, a, x );

The above description of beta() is copyrighted.
In this actor, alpha corresponds with a beta corresponds with b.

Since:

Ptolemy II 4.1

Version:

$Id: ColtBeta.java 57040 2010-01-27 20:52:32Z cxh $

Author:

David Bauer and Kostas Oikonomou

See Also:

Serialized Form

Accepted Rating:

Red (cxh)

Proposed Rating:

Red (cxh)

Nested Class Summary

Nested classes/interfaces inherited from class ptolemy.kernel.Entity

Entity.ContainedObjectsIterator

Field Summary

private double	_current The random number for the current iteration.
private cern.jet.random.Beta	_generator The random number generator.
PortParameter	alpha Alpha.
PortParameter	beta Beta.

Fields inherited from class ptolemy.actor.lib.colt.ColtRandomSource

_randomNumberGenerator, generatorClass

Fields inherited from class ptolemy.actor.lib.RandomSource

_generatorSeed, _needNew, _needNewGenerator, _random, resetOnEachRun, seed

Fields inherited from class ptolemy.actor.lib.Source

output, trigger

Fields inherited from class ptolemy.actor.AtomicActor

_actorFiringListeners, _initializables, _notifyingActorFiring, _stopRequested

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

ColtBeta(CompositeEntity container, java.lang.String name)
Construct an actor with the given container and name.

Method Summary

protected void	_createdNewRandomNumberGenerator() Method that is called after _randomNumberGenerator is changed.
protected void	_generateRandomNumber() Generate a new random number.
void	fire() Send a random number with a Beta distribution to the output.

Methods inherited from class ptolemy.actor.lib.colt.ColtRandomSource

_createGenerator, attributeChanged

Methods inherited from class ptolemy.actor.lib.RandomSource

clone, initialize, postfire

Methods inherited from class ptolemy.actor.lib.Source

prefire

Methods inherited from class ptolemy.actor.TypedAtomicActor

_addPort, _fireAt, _fireAt, attributeTypeChanged, clone, newPort, typeConstraintList, typeConstraints

Methods inherited from class ptolemy.actor.AtomicActor

_actorFiring, _actorFiring, addActorFiringListener, addInitializable, connectionsChanged, createReceivers, declareDelayDependency, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, isFireFunctional, isStrict, iterate, newReceiver, outputPortList, preinitialize, pruneDependencies, recordFiring, removeActorFiringListener, removeDependency, removeInitializable, setContainer, stop, stopFire, terminate, wrapup

Methods inherited from class ptolemy.kernel.ComponentEntity

_adjustDeferrals, _checkContainer, _getContainedObject, _propagateExistence, getContainer, instantiate, isAtomic, isOpaque, moveDown, moveToFirst, moveToIndex, moveToLast, moveUp, propagateExistence, setName

Methods inherited from class ptolemy.kernel.Entity

_description, _exportMoMLContents, _removePort, _validateSettables, connectedPortList, connectedPorts, containedObjectsIterator, getAttribute, getPort, getPorts, linkedRelationList, linkedRelations, portList, removeAllPorts, setClassDefinition, uniqueName

Methods inherited from class ptolemy.kernel.InstantiableNamedObj

_setParent, exportMoML, getChildren, getElementName, getParent, getPrototypeList, isClassDefinition, isWithinClassDefinition

Methods inherited from class ptolemy.kernel.util.NamedObj

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface ptolemy.actor.Actor

createReceivers, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, newReceiver, outputPortList

Methods inherited from interface ptolemy.actor.Executable

isFireFunctional, isStrict, iterate, stop, stopFire, terminate

Methods inherited from interface ptolemy.actor.Initializable

addInitializable, preinitialize, removeInitializable, wrapup

Methods inherited from interface ptolemy.kernel.util.Nameable

description, getContainer, getDisplayName, getFullName, getName, getName, setName

Methods inherited from interface ptolemy.kernel.util.Derivable

getDerivedLevel, getDerivedList, propagateValue

Field Detail

alpha

public PortParameter alpha

Alpha. This has type double with default 2.0.

beta

public PortParameter beta

Beta. This has type double with default 2.0.

_current

private double _current

The random number for the current iteration.

_generator

private cern.jet.random.Beta _generator

The random number generator.

Constructor Detail

ColtBeta

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

Construct an actor with the given container and name.

Parameters:

container - The container.

name - The name of this actor.

Throws:

IllegalActionException - If the actor cannot be contained by the proposed container.

NameDuplicationException - If the container already has an actor with this name.

Method Detail

fire

public void fire()
          throws IllegalActionException

Send a random number with a Beta distribution to the output. This number is only changed in the prefire() method, so it will remain constant throughout an iteration.

Specified by:

fire in interface Executable

Overrides:

fire in class RandomSource

Throws:

IllegalActionException - If there is no director.

_createdNewRandomNumberGenerator

protected void _createdNewRandomNumberGenerator()

Method that is called after _randomNumberGenerator is changed.

Specified by:

_createdNewRandomNumberGenerator in class ColtRandomSource

_generateRandomNumber

protected void _generateRandomNumber()
                              throws IllegalActionException

Generate a new random number.

Specified by:

_generateRandomNumber in class RandomSource

Throws:

IllegalActionException - If parameter values are incorrect.