idl.tmt.representation.transformations
Class TfIdfWeighter

java.lang.Object
  |
  +--idl.tmt.representation.transformations.TfIdfWeighter

All Implemented Interfaces:

CollectionTransformation

public class TfIdfWeighter

extends java.lang.Object

implements CollectionTransformation

weights all cells of the term-document matrix by the tf-idf weight

Author:

miles

Field Summary

private boolean

hasBeenRun

Fields inherited from interface idl.tmt.representation.transformations.CollectionTransformation

STATUS_COMPLETE, STATUS_NONE

Constructor Summary

TfIdfWeighter()

Method Summary

java.lang.String	getStatus() Provides a short string description of the collection transformation.
boolean	makesMatrixDense() Indicates whether the modification to the collection by this transformation makes the underlying matrix a dense matrix.
void	transformCollection(IndexedCollection collection) general method for transforming the given collection.
private TmtMatrix	transformMatrix(TmtMatrix m)

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait

Field Detail

hasBeenRun

private boolean hasBeenRun

Constructor Detail

TfIdfWeighter

public TfIdfWeighter()

Method Detail

transformMatrix

private TmtMatrix transformMatrix(TmtMatrix m)

transformCollection

public void transformCollection(IndexedCollection collection)

Description copied from interface: CollectionTransformation

general method for transforming the given collection. the implementors should modify this colleciton object, not create a new one.

Specified by:

transformCollection in interface CollectionTransformation

Following copied from interface: idl.tmt.representation.transformations.CollectionTransformation

Parameters:

collection -

makesMatrixDense

public boolean makesMatrixDense()

Description copied from interface: CollectionTransformation

Indicates whether the modification to the collection by this transformation makes the underlying matrix a dense matrix. This method is used to indicated if the matrix should be written to disk after this transformation is performed.

Specified by:

makesMatrixDense in interface CollectionTransformation

Following copied from interface: idl.tmt.representation.transformations.CollectionTransformation

Returns:

getStatus

public java.lang.String getStatus()

Description copied from interface: CollectionTransformation

Provides a short string description of the collection transformation. Implementors should return the CollectionTransformation.STAUS_NONE if the transformation has not yet been run.

Specified by:

getStatus in interface CollectionTransformation