tokens_tolower and tokens_toupper convert the features of a tokens object and reindex the types.

tokens_tolower(x, keep_acronyms = FALSE, ...)

tokens_toupper(x, ...)

Arguments

x

the input object whose character/tokens/feature elements will be case-converted

keep_acronyms

logical; if TRUE, do not lowercase any all-uppercase words (applies only to *_tolower functions)

...

additional arguments passed to stringi functions, (e.g. stri_trans_tolower), such as locale

Examples

# for a document-feature matrix toks <- tokens(c(txt1 = "b A A", txt2 = "C C a b B")) tokens_tolower(toks)
#> tokens from 2 documents. #> txt1 : #> [1] "b" "a" "a" #> #> txt2 : #> [1] "c" "c" "a" "b" "b" #>
tokens_toupper(toks)
#> tokens from 2 documents. #> txt1 : #> [1] "B" "A" "A" #> #> txt2 : #> [1] "C" "C" "A" "B" "B" #>