Removes sentences from a corpus or a character vector shorter than a specified length.
corpus_trim(x, what = c("sentences", "paragraphs", "documents"), min_ntoken = 1, max_ntoken = NULL, exclude_pattern = NULL) char_trim(x, what = c("sentences", "paragraphs", "documents"), min_ntoken = 1, max_ntoken = NULL, exclude_pattern = NULL)
x | corpus or character object whose sentences will be selected. |
---|---|
what | units of trimming, |
min_ntoken, max_ntoken | minimum and maximum lengths in word tokens (excluding punctuation) |
exclude_pattern | a stringi regular expression whose match (at the sentence level) will be used to exclude sentences |
a corpus or character vector equal in length to the input. If
the input was a corpus, then the all docvars and metadata are preserved.
For documents whose sentences have been removed entirely, a null string
(""
) will be returned.
txt <- c("PAGE 1. This is a single sentence. Short sentence. Three word sentence.", "PAGE 2. Very short! Shorter.", "Very long sentence, with multiple parts, separated by commas. PAGE 3.") mycorp <- corpus(txt, docvars = data.frame(serial = 1:3)) texts(mycorp)#> text1 #> "PAGE 1. This is a single sentence. Short sentence. Three word sentence." #> text2 #> "PAGE 2. Very short! Shorter." #> text3 #> "Very long sentence, with multiple parts, separated by commas. PAGE 3."#> text1 #> "This is a single sentence. Three word sentence." #> text3 #> "Very long sentence, with multiple parts, separated by commas."# exclude sentences that start with "PAGE <digit(s)>" texts(corpus_trim(mycorp, exclude_pattern = "^PAGE \\d+"))#> text1 #> "This is a single sentence. Short sentence. Three word sentence." #> text2 #> "Very short! Shorter." #> text3 #> "Very long sentence, with multiple parts, separated by commas."# trimming character objects char_trim(txt, "sentences", min_ntoken = 3)#> text1 #> "This is a single sentence. Three word sentence." #> text3 #> "Very long sentence, with multiple parts, separated by commas."char_trim(txt, "sentences", exclude_pattern = "sentence\\.")#> text1 #> "PAGE 1." #> text2 #> "PAGE 2. Very short! Shorter." #> text3 #> "Very long sentence, with multiple parts, separated by commas. PAGE 3."