quanteda (version 0.9.2-0)

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

## 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, removePunct = TRUE), stopwords("english"))

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

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

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