On 2010/06/09, at 17:17, [email protected] wrote: > Hello, > > I am using GNU Prolog 1.3.1. > > I use this code : > > % int(?I) : I is an integer > int(z). > int(s(X)) :- int(X). > > % odd(?I) : I is an odd integer > odd(s(z)). > odd(s(s(X))) :- odd(X). > > % intzodd(?I) : I is an odd integer or zero (z) > intzodd(X) :- X=z. > intzodd(X) :- odd(X). > > % listzodd(?L) : L is a list which each element is an odd integer or zero (z) > listzodd(X) :- maplist(intzodd, X). > > And I don't find the maplist built-in predicate. > > | ?- listzodd([z]). > uncaught exception: error(existence_error(procedure,maplist/2),listzodd/1) > > Where is the maplist built-in predicate, please?
maplist/2 is not a built-in predicate in GNU Prolog and, as far as I know, in any other Prolog compiler. Some Prolog compilers, however, provide it in a library. You will need to define it yourself. Is easy. Cheers, Paulo ----------------------------------------------------------------- Paulo Jorge Lopes de Moura, PhD Assistant Professor Dep. of Computer Science, University of Beira Interior 6201-001 Covilhã, Portugal Office 3.18 Ext. 3276 Phone: +351 275319891 Fax: +351 275319899 Email: <mailto:[email protected]> Home page: <http://www.di.ubi.pt/~pmoura> Research: <http://logtalk.org/> Blog: <http://blog.logtalk.org/> ----------------------------------------------------------------- _______________________________________________ Users-prolog mailing list [email protected] http://lists.gnu.org/mailman/listinfo/users-prolog
