LUHN
Luhn Check Digit for Error Detection

LUHN, a MATLAB library which demonstrates the calculation and use of the Luhn check digit for error detection.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

LUHN is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Data and Programs:

BANK, a MATLAB library which can compute the check digit associated with a US Bank Routing Number check digit, or it can report whether a 9-digit code is actually valid.

ISBN, a MATLAB library which can determine the check digit for an International Standard Book Number or report whether a given ISBN is valid.

luhn_test

UPC, a MATLAB library which can determine the check digit for a Uniform Product Code (UPC) or report whether a given UPC is valid.

Source Code:

• ch_is_digit.m, is TRUE if a character is a decimal digit.
• ch_to_digit.m, returns the value of a base 10 digit.
• i4vec_print.m, prints an I4VEC.
• luhn_check_digit_calculate.m, determines the Luhn check digit of a string.
• luhn_checksum.m, determines the Luhn checksum of a string.
• luhn_is_valid.m, determines whether a string with Luhn check digit is valid.
• s_digits_count.m, counts the digits in a string.
• s_to_digits.m, extracts N digits from a string.
• timestamp.m, prints the current YMDHMS date as a time stamp.