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

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.
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

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

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

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