weka.classifiers.rules
Class Rule

java.lang.Object
  weka.classifiers.rules.Rule

All Implemented Interfaces:

Copyable, java.io.Serializable, WeightedInstancesHandler

Direct Known Subclasses:

JRip.RipperRule

public abstract class Rule

extends java.lang.Object

implements WeightedInstancesHandler, Copyable, java.io.Serializable

Abstract class of generic rule

Version:

$Revision: 1.3 $

Author:

Xin Xu (xx5@cs.waikato.ac.nz)

See Also:

Serialized Form

Constructor Summary

Rule()

Method Summary

java.lang.Object	copy() Get a shallow copy of this rule
abstract boolean	covers(Instance datum) Whether the instance covered by this rule
abstract double	getConsequent() Get the consequent of this rule, i.e. the predicted class
abstract void	grow(Instances data) Build this rule
abstract boolean	hasAntds() Whether this rule has antecedents, i.e. whether it is a default rule
abstract double	size() The size of the rule.

Methods inherited from class java.lang.Object

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

Constructor Detail

Rule

public Rule()

Method Detail

copy

public java.lang.Object copy()

Get a shallow copy of this rule

Specified by:

copy in interface Copyable

Returns:

the copy

covers

public abstract boolean covers(Instance datum)

Whether the instance covered by this rule

Returns:

the boolean value indicating whether the instance is covered by this rule

grow

public abstract void grow(Instances data)
                   throws java.lang.Exception

Build this rule

Parameters:

data - the data used to build the rule

Throws:

if - rule cannot be built

java.lang.Exception

hasAntds

public abstract boolean hasAntds()

Whether this rule has antecedents, i.e. whether it is a default rule

Returns:

the boolean value indicating whether the rule has antecedents

getConsequent

public abstract double getConsequent()

Get the consequent of this rule, i.e. the predicted class

Returns:

the consequent

size

public abstract double size()

The size of the rule. Could be number of antecedents in the case of conjunctive rule

Returns:

the size of the rule