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## weka.classifiers.trees.m5
Class YongSplitInfo

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

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, 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
  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

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