On Saturday, 11 February 2017 at 20:19:51 UTC, Nestor wrote:
Notice this is no ordinary matrix, but an Anti-Simmetric QuasiGroup of order 10, and tmpdigit (called interim in the algorithm) is used in each round (although the function isn't recursive) together with each digit to calculate final check digit.
Yes i know, which is why i had 3 to calculate 2 inputs because the third is the temp/previous calculation.
If however you were calculating a fixed number of digits a single table could be made and do a single lookup, assuming it wasn't too large to make it uncumbersome or impractical.
