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## weka.classifiers.trees.m5
Interface SplitEvaluate

All Known Implementing Classes:
  CorrelationSplitInfo, YongSplitInfo

    public interface SplitEvaluate

Interface for objects that determine a split point on an attribute

Version:
  $Revision: 1.3 $
Author:
  Mark Hall (mhall@cs.waikato.ac.nz)

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 the SplitEvaluate object
`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

Method Detail

### copy

    SplitEvaluate copy()
                       throws java.lang.Exception

  makes a copy of the SplitEvaluate object

  Returns:
    a copy of the object
  Throws:
    `java.lang.Exception`

### attrSplit

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

  Finds the best splitting point for an attribute in the instances

  Parameters:
    `attr` - the splitting attribute
    `inst` - the instances
  Throws:
    `java.lang.Exception` - if something goes wrong

### maxImpurity

    double maxImpurity()

  Returns the impurity of this split

  Returns:
    the impurity of this split

### position

    int position()

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

  Returns:
    an `int` value

### splitAttr

    int splitAttr()

  Returns the attribute used in this split

  Returns:
    the attribute used in this split

### splitValue

    double splitValue()

  Returns the split value

  Returns:
    the split value

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