Sep 10, 2014 at 7:39 AM
Edited Sep 10, 2014 at 7:40 AM

Which algorithm is most suited for comparing numbers
ie. 123456789
123456189
or
123456789
123465789
or
123456789
128456789
or
123456789
12345678
etc



Without knowing what you are trying to achieve, here is some general advice
http://en.wikipedia.org/wiki/String_metric
http://en.wikipedia.org/wiki/Edit_distance
http://en.wikipedia.org/wiki/Levenshtein_distance (see section 3 in particular)
Taking your second example {123456789, 123465789} The strings differ by 1 transposition, so if you compared the two using the Damerau–Levenshtein distance algorithm your edit distance would be 1. Using Levenshtein your edit distance would be 2. DamerauLevenshtein
would be better at finding two numbers that have digits swapped around. Levenshtein is good at finding two numbers that only differ by n digits. Longest Substring would help find numbers with the largest matching sections (may be useful if these were phone
numbers for example).

