ntoken: Count the number of tokens or types

In koheiw/quanteda.core: Quantitative Analysis of Textual Data

Description

Get the count of tokens (total features) or types (unique tokens).

Usage

ntoken(x, ...)

ntype(x, ...)

Arguments

x	a quanteda object: a character, corpus, tokens, or dfm object
...	additional arguments passed to tokens()

Details

The precise definition of "tokens" for objects not yet tokenized (e.g. character or corpus objects) can be controlled through optional arguments passed to tokens() through ....

For dfm objects, ntype will only return the count of features that occur more than zero times in the dfm.

Value

named integer vector of the counts of the total tokens or types

Note

Due to differences between raw text tokens and features that have been defined for a dfm, the counts may be different for dfm objects and the texts from which the dfm was generated. Because the method tokenizes the text in order to count the tokens, your results will depend on the options passed through to tokens().

Examples

# simple example
txt <- c(text1 = "This is a sentence, this.", text2 = "A word. Repeated repeated.")
ntoken(txt)
ntype(txt)
ntoken(char_tolower(txt))  # same
ntype(char_tolower(txt))   # fewer types
ntoken(char_tolower(txt), remove_punct = TRUE)
ntype(char_tolower(txt), remove_punct = TRUE)

# with some real texts
ntoken(corpus_subset(data_corpus_inaugural, Year < 1806), remove_punct = TRUE)
ntype(corpus_subset(data_corpus_inaugural, Year < 1806), remove_punct = TRUE)
ntoken(dfm(corpus_subset(data_corpus_inaugural, Year < 1800)))
ntype(dfm(corpus_subset(data_corpus_inaugural, Year < 1800)))

koheiw/quanteda.core documentation built on Sept. 21, 2020, 3:44 p.m.