# letterToNumber: Convert letters to numbers as on a telephone's keypad In phonenumber: Convert Letters to Numbers and Back as on a Telephone Keypad

## Description

Take a character vector and convert it to the equivalent number sequence from a telephone's key pad

## Usage

 `1` ```letterToNumber(value, qz = 1) ```

## Arguments

 `value` An input value as a character vector with one element (a string) `qz` Whether to assign q and z to zero (qz = 0) or not (any other value)

## Value

A character vector of numbers and dashes based on value

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19``` ```# Convert an alphabetic string can be converted directly (with # non-alphanumeric characters replaced by dashes) letterToNumber("R functions") # returns "7-386284667" # Of course, vectors containing strings can also be converted string <- "Phone Number" letterToNumber(string) # returns "74663-686237" # Alphanumeric strings can also be converted with numbers being returned as # is letterToNumber("Jenny's number is 867-5309") # returns "53669-7-686237-47-867-5309" # Specifying qz = 0 maps "q" and "z" to 0 instead of 7 and 9 letterToNumber("qz") # returns "79" letterToNumber("qz", qz = 0) # returns ("00") ```

phonenumber documentation built on May 30, 2017, 4:41 a.m.