tm (version 0.4)

WeightFunction: Weighting Function Constructor

Description

Constructs a weighting function for term-document matrices.

Usage

WeightFunction(object, name, acronym)

Arguments

object

A function which takes a dgCMatrix term-document matrix with term frequencies as input, weights the elements, and returns the weighted matrix.

name

A character naming the weighting function.

acronym

A character giving an acronym for the name of the weighting function.

Value

• An S4 object of class WeightFunction which extends the class function representing a weighting function.

Examples

weightCutBin <- WeightFunction(function(m, cutoff) as(m > cutoff, "dgCMatrix"), "binary with cutoff", "bincut")