alpha2int {VLMC}

‘Single Character’ <–> Integer Conversion for Discrete Data

Description

Simple conversion functions for discrete data (e.g., time series), between 0:k integers and single letter characters.

Usage

alpha2int(x, alpha)
int2alpha(i, alpha)

Arguments

x

character vector of single letters.

alpha

the alphabet, as one character string.

i

integer vector of numbers in 0:k.

Value

alpha2int(x,*) returns an integer vector of the same length as x, consisting of values from 0:k where k + 1 is the length of the alphabet, nchar(alpha).

int2alpha(i,*) returns a vector of single letter character of the same length as i.

See Also

vlmc, and int2char() and its inverse, char2int(), both working with multi-character strings instead of vectors of single characters; further, alphabet.

Examples

alphabet <- "abcdefghijk"
(ch <- sample(letters[1:10], 30, replace = TRUE))
(ic <- alpha2int(ch, alphabet))
stopifnot(int2alpha(ic, alphabet) == ch)