Last data update: 2014.03.03

 R: Extract words from a sentence.
wordR Documentation

Extract words from a sentence.

Description

Extract words from a sentence.

Usage

word(string, start = 1L, end = start, sep = fixed(" "))

Arguments

string

input character vector.

start

integer vector giving position of first word to extract. Defaults to first word. If negative, counts backwards from last character.

end

integer vector giving position of last word to extract. Defaults to first word. If negative, counts backwards from last character.

sep

separator between words. Defaults to single space.

Value

character vector of words from start to end (inclusive). Will be length of longest input argument.

Examples

sentences <- c("Jane saw a cat", "Jane sat down")
word(sentences, 1)
word(sentences, 2)
word(sentences, -1)
word(sentences, 2, -1)

# Also vectorised over start and end
word(sentences[1], 1:3, -1)
word(sentences[1], 1, 1:4)

# Can define words by other separators
str <- 'abc.def..123.4568.999'
word(str, 1, sep = fixed('..'))
word(str, 2, sep = fixed('..'))

Results


Created & Maintained by Osamu Ogasawara (osamu.ogasawara@gmail.com) and IMSBIO