edu.ucla.sspace.matrix

Class TfIdfTransform.TfIdfGlobalTransform

java.lang.Object

edu.ucla.sspace.matrix.TfIdfTransform.TfIdfGlobalTransform

All Implemented Interfaces:

GlobalTransform

Enclosing class:

TfIdfTransform

public class TfIdfTransform.TfIdfGlobalTransform
extends Object
implements GlobalTransform

Constructor Summary

Constructors

Constructor and Description
TfIdfTransform.TfIdfGlobalTransform(File inputMatrixFile, MatrixIO.Format format) Creates an instance of TfIdfGlobalTransform from a File in the format MatrixIO.Format.
TfIdfTransform.TfIdfGlobalTransform(Matrix matrix) Creates an instance of TfIdfGlobalTransform from a Matrix.

Method Summary

Methods

Modifier and Type	Method and Description
double	transform(int row, int column, double value) Computes the Term Frequency-Inverse Document Frequency for a given value where value is the observed frequency of term row in document column.

Methods inherited from class java.lang.Object

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

Constructor Detail

TfIdfTransform.TfIdfGlobalTransform

public TfIdfTransform.TfIdfGlobalTransform(Matrix matrix)

Creates an instance of TfIdfGlobalTransform from a Matrix.

TfIdfTransform.TfIdfGlobalTransform

public TfIdfTransform.TfIdfGlobalTransform(File inputMatrixFile,
                                   MatrixIO.Format format)

Creates an instance of TfIdfGlobalTransform from a File in the format MatrixIO.Format.

Method Detail

transform

public double transform(int row,
               int column,
               double value)

Computes the Term Frequency-Inverse Document Frequency for a given value where value is the observed frequency of term row in document column.

Specified by:

transform in interface GlobalTransform

Parameters:

row - The index speicifying the term being observed

column - The index specifying the document being observed

value - The number of occurances of the term in the document.

Returns:

the TF-IDF of the observed value