phonenumber (version 0.1.0)
Convert Letters to Numbers and Back as on a Telephone Keypad
Description
Convert English letters to numbers or numbers to English letters as
on a telephone keypad. When converting letters to numbers, a character
vector is returned with "A," "B," or "C" becoming 2, "D," "E", or "F"
becoming 3, etc. When converting numbers to letters, a character vector is
returned with multiple elements (i.e., "2" becomes a vector of "A," "B," and
"C").