qdap (version 1.3.5)

Filter.all_words: Filter

Description

Filter.all_words - Filter words from a all_words that meet max/min word length criteria. Filter.TermDocumentMatrix - Filter words from a TermDocumentMatrix vector that meet max/min word length criteria. Filter.DocumentTermMatrix - Filter words from a DocumentTermMatrix that meet max/min word length criteria. Filter - Filter words from various objects that meet max/min word length criteria. Filter.character - Filter words from a character vector that meet max/min word length criteria. Filter.fwl - Filter words from a fwl that meet max/min word length criteria. Filter.fswl - Filter words from a fswl that meet max/min word length criteria. Filter.rfswl - Filter words from a rfswl that meet max/min word length criteria.

Usage

## S3 method for class 'all_words':
Filter(x, min = 1, max = Inf, count.apostrophe = TRUE,
  stopwords = NULL, ignore.case = TRUE, ...)

## S3 method for class 'TermDocumentMatrix':
Filter(x, min = 1, max = Inf,
  count.apostrophe = TRUE, stopwords = NULL, ignore.case = TRUE, ...)

## S3 method for class 'DocumentTermMatrix':
Filter(x, min = 1, max = Inf,
  count.apostrophe = TRUE, stopwords = NULL, ignore.case = TRUE, ...)

Filter(x, min = 1, max = Inf, count.apostrophe = TRUE, stopwords = NULL,
  ignore.case = TRUE, ...)

## S3 method for class 'character':
Filter(x, min = 1, max = Inf, count.apostrophe = TRUE,
  stopwords = NULL, ignore.case = TRUE, ...)

## S3 method for class 'fwl':
Filter(x, min = 1, max = Inf, count.apostrophe = TRUE,
  stopwords = NULL, ignore.case = TRUE, ...)

## S3 method for class 'fswl':
Filter(x, min = 1, max = Inf, count.apostrophe = TRUE,
  stopwords = NULL, ignore.case = TRUE, ...)

## S3 method for class 'rfswl':
Filter(x, min = 1, max = Inf, count.apostrophe = TRUE,
  stopwords = NULL, ignore.case = TRUE, ...)

Arguments

x

A filterable object (e.g., wfm, character).

min

Minimum word length.

max

Maximum word length.

count.apostrophe

logical. If TRUE apostrophes are counted as characters.

stopwords

A vector of stop words to remove.

ignore.case

logical. If TRUE stopwords will be removed regardless of case (ignored if used on a wfm).

...

Other arguments passed to specific Filter methods.

Value

• Filter.all_words - Returns a matrix of the class "all_words". Filter.TermDocumentMatrix - Returns a matrix of the class "TermDocumentMatrix". Filter.DocumentTermMatrix - Returns a matrix of the class "DocumentTermMatrix". Filter.character - Returns a vector of the class "character". Filter.wfm - Returns a matrix of the class "wfm". Filter.fwl - Returns a matrix of the class "fwl". Filter.fswl - Returns a matrix of the class "fswl". Filter.rfswl - Returns a matrix of the class "rfswl".

Details

all_words Method for Filter TermDocumentMatrix Method for Filter DocumentTermMatrix Method for Filter character Method for Filter fwl Method for Filter fswl Method for Filter rfswl Method for Filter

Examples

Filter(with(DATA, wfm(state, list(sex, adult))), 5)
with(DATA, wfm(state, list(sex, adult)))

## Filter particular words based on max/min values in wfm
v <- with(DATA, wfm(state, list(sex, adult)))
Filter(v, 5)
Filter(v, 5, count.apostrophe = FALSE)
Filter(v, 5, 7)
Filter(v, 4, 4)
Filter(v, 3, 4)
Filter(v, 3, 4, stopwords = Top25Words)

## Filter works on character strings too...
x <- c("Raptors don't like robots!",  "I'd pay $500.00 to rid them.")
Filter(x, 3)
Filter(x, 4)
Filter(x, 4, count.apostrophe = FALSE)
Filter(x, 4, count.apostrophe = FALSE, stopwords="raptors")
Filter(x, 4, stopwords="raptors")
Filter(x, 4, stopwords="raptors", ignore.case = FALSE)

DATA[, "state"] <- Filter(DATA[, "state"], 4)
DATA <- qdap::DATA