Package weka.classifiers.trees.adtree
Class TwoWayNumericSplit
- java.lang.Object
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- weka.classifiers.trees.adtree.Splitter
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- weka.classifiers.trees.adtree.TwoWayNumericSplit
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Cloneable
,RevisionHandler
public class TwoWayNumericSplit extends Splitter
Class representing a two-way split on a numeric attribute, of the form: either 'is < some_value' or 'is >= some_value'.- Version:
- $Revision: 1.6 $
- Author:
- Richard Kirkby (rkirkby@cs.waikato.ac.nz)
- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class weka.classifiers.trees.adtree.Splitter
orderAdded
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Constructor Summary
Constructors Constructor Description TwoWayNumericSplit(int _attIndex, double _splitPoint)
Creates a new two-way numeric splitter.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.String
attributeString(Instances dataset)
Gets the string describing the attributes the split depends on.int
branchInstanceGoesDown(Instance inst)
Gets the index of the branch that an instance applies to.java.lang.Object
clone()
Clones this node.java.lang.String
comparisonString(int branchNum, Instances dataset)
Gets the string describing the comparision the split depends on for a particular branch.boolean
equalTo(Splitter compare)
Tests whether two splitters are equivalent.PredictionNode
getChildForBranch(int branchNum)
Gets the child for a branch of the split.int
getNumOfBranches()
Gets the number of branches of the split.java.lang.String
getRevision()
Returns the revision string.ReferenceInstances
instancesDownBranch(int branch, Instances instances)
Gets the subset of instances that apply to a particluar branch of the split.void
setChildForBranch(int branchNum, PredictionNode childPredictor)
Sets the child for a branch of the split.
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Method Detail
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getNumOfBranches
public int getNumOfBranches()
Gets the number of branches of the split.- Specified by:
getNumOfBranches
in classSplitter
- Returns:
- the number of branches (always = 2)
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branchInstanceGoesDown
public int branchInstanceGoesDown(Instance inst)
Gets the index of the branch that an instance applies to. Returns -1 if no branches apply.- Specified by:
branchInstanceGoesDown
in classSplitter
- Parameters:
inst
- the instance- Returns:
- the branch index
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instancesDownBranch
public ReferenceInstances instancesDownBranch(int branch, Instances instances)
Gets the subset of instances that apply to a particluar branch of the split. If the branch index is -1, the subset will consist of those instances that don't apply to any branch.- Specified by:
instancesDownBranch
in classSplitter
- Parameters:
branch
- the index of the branchinstances
- the instances from which to find the subset- Returns:
- the set of instances that apply
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attributeString
public java.lang.String attributeString(Instances dataset)
Gets the string describing the attributes the split depends on. i.e. the left hand side of the description of the split.- Specified by:
attributeString
in classSplitter
- Parameters:
dataset
- the dataset that the split is based on- Returns:
- a string describing the attributes
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comparisonString
public java.lang.String comparisonString(int branchNum, Instances dataset)
Gets the string describing the comparision the split depends on for a particular branch. i.e. the right hand side of the description of the split.- Specified by:
comparisonString
in classSplitter
- Parameters:
branchNum
- the branch of the splitdataset
- the dataset that the split is based on- Returns:
- a string describing the comparison
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equalTo
public boolean equalTo(Splitter compare)
Tests whether two splitters are equivalent.
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setChildForBranch
public void setChildForBranch(int branchNum, PredictionNode childPredictor)
Sets the child for a branch of the split.- Specified by:
setChildForBranch
in classSplitter
- Parameters:
branchNum
- the branch to set the child forchildPredictor
- the new child
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getChildForBranch
public PredictionNode getChildForBranch(int branchNum)
Gets the child for a branch of the split.- Specified by:
getChildForBranch
in classSplitter
- Parameters:
branchNum
- the branch to get the child for- Returns:
- the child
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clone
public java.lang.Object clone()
Clones this node. Performs a deep copy, recursing through the tree.
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getRevision
public java.lang.String getRevision()
Returns the revision string.- Returns:
- the revision
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