weka.classifiers.trees.m5
Class YongSplitInfo

java.lang.Object
  weka.classifiers.trees.m5.YongSplitInfo

All Implemented Interfaces:

java.lang.Cloneable, java.io.Serializable, SplitEvaluate

public final class YongSplitInfo

extends java.lang.Object

implements java.lang.Cloneable, java.io.Serializable, SplitEvaluate

Stores split information.

Version:

$Revision: 1.1 $

Author:

Yong Wang (yongwang@cs.waikato.ac.nz), Mark Hall (mhall@cs.waikato.ac.nz)

See Also:

Serialized Form

Field Summary

private int	first
private int	last
private double	leftAve
private double	maxImpurity
private int	number
private int	position
private double	rightAve
private int	splitAttr
private double	splitValue

Constructor Summary

YongSplitInfo(int low, int high, int attr)
Constructs an object which contains the split information

Method Summary

void	attrSplit(int attr, Instances inst) Finds the best splitting point for an attribute in the instances
SplitEvaluate	copy() Makes a copy of this SplitInfo object
void	initialize(int low, int high, int attr) Resets the object of split information
double	maxImpurity() Returns the impurity of this split
int	position() Returns the position of the split in the sorted values. -1 indicates that a split could not be found.
int	splitAttr() Returns the attribute used in this split
double	splitValue() Returns the split value
java.lang.String	toString(Instances inst) Converts the spliting information to string

Methods inherited from class java.lang.Object

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

Field Detail

number

private int number

first

private int first

last

private int last

position

private int position

maxImpurity

private double maxImpurity

leftAve

private double leftAve

rightAve

private double rightAve

splitAttr

private int splitAttr

splitValue

private double splitValue

Constructor Detail

YongSplitInfo

public YongSplitInfo(int low,
                     int high,
                     int attr)

Constructs an object which contains the split information

Parameters:

low - the index of the first instance

high - the index of the last instance

attr - an attribute

Method Detail

copy

public final SplitEvaluate copy()
                         throws java.lang.Exception

Makes a copy of this SplitInfo object

Specified by:

copy in interface SplitEvaluate

Returns:

a copy of the object

Throws:

java.lang.Exception

initialize

public final void initialize(int low,
                             int high,
                             int attr)

Resets the object of split information

Parameters:

low - the index of the first instance

high - the index of the last instance

attr - the attribute

toString

public final java.lang.String toString(Instances inst)

Converts the spliting information to string

Parameters:

inst - the instances

attrSplit

public final void attrSplit(int attr,
                            Instances inst)
                     throws java.lang.Exception

Finds the best splitting point for an attribute in the instances

Specified by:

attrSplit in interface SplitEvaluate

Parameters:

attr - the splitting attribute

inst - the instances

Throws:

java.lang.Exception - if something goes wrong

maxImpurity

public double maxImpurity()

Returns the impurity of this split

Specified by:

maxImpurity in interface SplitEvaluate

Returns:

the impurity of this split

splitAttr

public int splitAttr()

Returns the attribute used in this split

Specified by:

splitAttr in interface SplitEvaluate

Returns:

the attribute used in this split

position

public int position()

Returns the position of the split in the sorted values. -1 indicates that a split could not be found.

Specified by:

position in interface SplitEvaluate

Returns:

an int value

splitValue

public double splitValue()

Returns the split value

Specified by:

splitValue in interface SplitEvaluate

Returns:

the split value