Hey William, David, Bryan
Thanks a lot for your fast responses. I know the [tabletool] from the tID library and it works really fine.
I will check [listtool] and [ptrdiff_t]
I am very interested in any types of measures and objects avaliable.
But specifically I am interested the "swap distance" or the "edit distance" [1]. I have been trying to implement my self the edit distance and have managed to make a patch according to its Levenshtein implementation [2] from wikipedia, trying to make it work with numbers instead of characters. Although it is a simple algorithm, It is not trivial to implement in PD and still have not managed to make it work properly.
If any one is interested I would appreciate any help. Even finding an object that computes any of these distances; or better making the abstraction work. I guess it could be a useful object for the community.