weka.attributeSelection
Interface AttributeTransformer

All Known Implementing Classes:

PrincipalComponents

public interface AttributeTransformer

Abstract attribute transformer. Transforms the dataset.

Version:

$Revision: 1.6 $

Author:

Mark Hall (mhall@cs.waikato.ac.nz)

Method Summary

Instance	convertInstance(Instance instance) Transforms an instance in the format of the original data to the transformed space
Instances	transformedData() Returns the transformed data
Instances	transformedHeader() Returns just the header for the transformed data (ie. an empty set of instances.

Method Detail

transformedHeader

public Instances transformedHeader()
                            throws java.lang.Exception

Returns just the header for the transformed data (ie. an empty set of instances. This is so that AttributeSelection can determine the structure of the transformed data without actually having to get all the transformed data through getTransformedData().

Returns:

the header of the transformed data.

Throws:

java.lang.Exception - if the header of the transformed data can't be determined.

transformedData

public Instances transformedData()
                          throws java.lang.Exception

Returns the transformed data

Returns:

A set of instances representing the transformed data

Throws:

java.lang.Exception - if the attribute could not be evaluated

convertInstance

public Instance convertInstance(Instance instance)
                         throws java.lang.Exception

Transforms an instance in the format of the original data to the transformed space

Returns:

a transformed instance

Throws:

java.lang.Exception - if the instance could not be transformed