fdm2id (version 1.0.1)

getvocab: Extract words and phrases from a corpus

Description

Extract words and phrases from a corpus of documents.

Usage

getvocab(
  corpus,
  mincount = 5,
  minphrasecount = NULL,
  ngram = 1,
  lang = "en",
  stopwords = lang,
  excludewords = NULL,
  removesinglechars = TRUE,
  ...
)

Value

The vocabulary used in the corpus of documents.

Arguments

corpus

The corpus of documents (a vector of characters).

mincount

Minimum word count to be considered as frequent.

minphrasecount

Minimum collocation of words count to be considered as frequent.

ngram

maximum size of n-grams.

lang

The language of the documents (NULL if no stemming).

stopwords

The language whose stop words are removed ("en", ...), or NULL to keep them. A list of words of your own goes to excludewords.

excludewords

An optional custom vector of additional words to exclude from the vocabulary (e.g. corpus-specific stop words), on top of (or instead of) the language stopwords given through stopwords.

removesinglechars

Whether single-character tokens are removed during cleanup.

...

Other parameters.

See Also

plotzipf, stopwords, create_vocabulary

Examples

data (capitals)
vocab1 = getvocab (capitals, mincount = 2) # With stemming
nrow (vocab1)
vocab2 = getvocab (capitals, mincount = 2, lang = NULL) # Without stemming
nrow (vocab2)
# Excluding additional, corpus-specific words
vocab3 = getvocab (capitals, mincount = 2, excludewords = c ("capital", "europe"))