SnowballStemmer {Snowball}R Documentation

R/Weka Snowball Stemmer

Description

R interface to Weka's Snowball stemmers.

Usage

SnowballStemmer(x, control = NULL)

Arguments

x

a character vector with words to be stemmed.

control

an object of class Weka_control, or a character vector of control options, or NULL (default). Available options can be obtained on-line using the Weka Option Wizard WOW, or the Weka documentation.

Details

The Snowball stemmers contain the Porter stemmer and several other stemmers for different languages. See http://snowball.tartarus.org/ for more information.

SnowballStemmer is an interface to Weka's wrapper classes for the Java version of the Snowball stemmers. The corresponding jar cannot be included in package RWeka due to license restrictions, and hence is made available via the separate package Snowball.

The Omegahat package Rstem provides an R interface to a C version of Porter's word stemming algorithm.

Value

A character vector with the stemmed words.

Note

MacOS X users may need to perform Sys.setenv(NOAWT = TRUE) before loading Snowball (and any other package using rJava).

See Also

Other R interfaces to Weka stemmers (RWeka\_stemmers)

Examples

## Test the supplied vocabulary for the default stemmer ('porter'):
source <- readLines(system.file("words", "porter","voc.txt",
                                package = "Snowball"))
result <- SnowballStemmer(source)
target <- readLines(system.file("words", "porter", "output.txt",
                                package = "Snowball"))
## Any differences?
any(result != target)
[Package Snowball version 0.0-10 Index]