quanteda (version 0.99)

removeFeatures: remove features from an object

Description

Removes features from a variety of objects, such as text, a dfm, or a list of collocations. The most common usage for removeFeatures will be to eliminate stop words from a text or text-based object. This function simply provides a convenience wrapper for selectFeatures where selection = "remove".

Usage

removeFeatures(x, features, ...)

Arguments

x

object from which stopwords will be removed

features

character vector of features to remove

...

additional arguments passed to selectFeatures

Value

an object with matching features removed

See Also

stopwords

Examples

# NOT RUN {
## for tokenized texts 
txt <- c(wash1 <- "Fellow citizens, I am again called upon by the voice of my country to 
                   execute the functions of its Chief Magistrate.",
         wash2 <- "When the occasion proper for it shall arrive, I shall endeavor to express
                   the high sense I entertain of this distinguished honor.")
removeFeatures(tokenize(txt, remove_punct = TRUE), stopwords("english"))

itText <- tokenize("Ecco alcuni di testo contenente le parole che vogliamo rimuovere.", 
                   remove_punct = TRUE)
removeFeatures(itText, stopwords("italian"), case_insensitive = TRUE)

## example for dfm objects
mydfm <- dfm(data_char_ukimmig2010, verbose=FALSE)
removeFeatures(mydfm, stopwords("english"))

## example for collocations
(myCollocs <- collocations(data_corpus_inaugural[1:3], n=20))
removeFeatures(myCollocs, stopwords("english"))
removeFeatures(myCollocs, stopwords("english"), pos = 2)
# }