weka.associations.tertius

Class Head

java.lang.Object

weka.associations.tertius.LiteralSet

weka.associations.tertius.Head

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, RevisionHandler

public class Head
extends LiteralSet

Class representing the head of a rule.

Version:

$Revision: 1.6 $

Author:

Amelie Deltour

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Head() Constructor without storing the counter-instances.
Head(Instances instances) Constructor storing the counter-instances.

Method Summary

Modifier and Type	Method and Description
boolean	canKeep(Instance instance, Literal newLit) Test if an instance can be kept as a counter-instance, if a new literal is added to this head.
java.lang.String	getRevision() Returns the revision string.
boolean	isIncludedIn(Rule otherRule) Test if this Head is included in a rule.
java.lang.String	toString() Gives a String representation of this set of literals as a disjunction.

Methods inherited from class weka.associations.tertius.LiteralSet

addElement, clone, contains, counterInstance, counterInstance, enumerateLiterals, getCounterInstancesFrequency, getCounterInstancesNumber, getLastLiteral, getType, hasMaxCounterInstances, isEmpty, negationIncludedIn, numLiterals, overFrequencyThreshold, upDate

Methods inherited from class java.lang.Object

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

Constructor Detail

Head

public Head()

Constructor without storing the counter-instances.

Head

public Head(Instances instances)

Constructor storing the counter-instances.

Parameters:

instances - The dataset.

Method Detail

canKeep

public boolean canKeep(Instance instance,
                       Literal newLit)

Test if an instance can be kept as a counter-instance, if a new literal is added to this head.

Specified by:

canKeep in class LiteralSet

Parameters:

instance - The instance to test.

newLit - The new literal.

Returns:

True if the instance is still a counter-instance (if the negation of the new literal satisfies the instance).

isIncludedIn

public boolean isIncludedIn(Rule otherRule)

Test if this Head is included in a rule. It is the literals of this Head are contained in the head of the other rule, or if their negation is included in the body of the other rule.

Specified by:

isIncludedIn in class LiteralSet

Parameters:

otherRule - The rule to test.

Returns:

True if this set of literals is included in the rule.

toString

public java.lang.String toString()

Gives a String representation of this set of literals as a disjunction.

Specified by:

toString in class LiteralSet

getRevision

public java.lang.String getRevision()

Returns the revision string.

Returns:

the revision