Question

I know this is a very simple question but I seem to be having some problems.

I am trying to stem a list of words using porter_stem but I am getting an error:

Out of local stack

This is my code:

stemming([],[]).
stemming([H|T], A) :-
    stemming(T,Answer),
    porter_stem(H,S),
    append(Answer,S,A).

Basically the pseudocode for this is as follows:

for all items in list
    stem item
    add item to list2
    return list2

Can anyone please point me in the right direction please?

Answer 1

Consider using maplist/3 or equivalent depending on your prolog implementation: something like maplist(porter_stem, List, Result). would suffice.

If you’re interested in learning how to build a proper recursion, post a comment and I’ll try to expand my answer 🙂