casefold
Convert Case of Character Strings

Description

Translate letters in a vector of character strings to all lower case or all upper case.

Usage

casefold(x, upper = FALSE)
tolower(x)
toupper(x)

Arguments

x a vector of values to be converted. This is coerced to mode character.
upper a logical flag. If TRUE, all characters are converted to upper case. If FALSE (the default), all characters are converted to lower case.

Details

Characters in x that are not letters are not changed. Attributes of x are lost in the output unless x is of mode character.
Value
a character vector with all letters translated to either lower case (if upper=FALSE) or upper case (if upper=TRUE).
See Also
charmatch
Examples
casefold(LETTERS)
tolower(LETTERS)  # same as previous line
casefold(letters, upper=T) 
toupper(letters)  # same as previous line
Package base version 6.1.1-7
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