Get the stem of words
This function extracts the stems of each of the given words in the vector.
wordStem(words, language = "porter")
words |
a character vector of words whose stems are to be extracted. |
language |
the name of a recognized language, as returned by
|
This uses Dr. Martin Porter's stemming algorithm and the C libstemmer library generated by Snowball.
A character vector with as many elements as there are in the input vector with the corresponding elements being the stem of the word. Elements of the vector are converted to UTF-8 encoding before the stemming is performed, and the returned elements are marked as such when they contain non-ASCII characters.
Milan Bouchet-Valat
http://www.loc.gov/standards/iso639-2/php/code_list.php for a list of ISO-639 language codes.
# Simple example
wordStem(c("win", "winning", "winner"))
# Test some of the vocabulary supplied at https://github.com/snowballstem/snowball-data
for(lang in getStemLanguages()) {
load(system.file("words", paste0(lang, ".RData"), package="SnowballC"))
stopifnot(all(wordStem(dat$words, lang) == dat$stem))
}
stopifnot(is.na(wordStem(NA)))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.