Prolog - Hash table and SWI-Prolog

Author

Hash table and SWI-Prolog

dpatte3@cs.umbc.edu

2005-04-16, 3:58 pm

In an earlier reply, Jan from SWI had mentioned a hash table. I can't
find any documentation on this in SWI-Prolog. Can someone help or do I
have to code my own. And does anyone know about the rdf parser, I want
to mimic it for another ontology format. Does the rdf library use the
same hash table.

Thanks
Dale

Jan Wielemaker

2005-04-16, 3:58 pm

On 2005-04-16, dpatte3@cs.umbc.edu <dpatte3@cs.umbc.edu> wrote:
> In an earlier reply, Jan from SWI had mentioned a hash table. I can't
> find any documentation on this in SWI-Prolog. Can someone help or do I

I do not know in which context. Hash-tables are used internally for
indexing predicates with many clauses (and many other things). It is
just a datastructure, so you can make one in Prolog if you want. Library
assoc.pl contains associations using binary trees, often a good choice
for Prolog.

> have to code my own. And does anyone know about the rdf parser, I want
> to mimic it for another ontology format. Does the rdf library use the
> same hash table.

No idea what you are after. The source is open though.

Success --- Jan

dpatte3@cs.umbc.edu

2005-04-21, 3:58 pm

assoc.pl - that's what I'm looking for.

Thanks

vannoord@let.rug.nl

2005-04-21, 3:58 pm

dpatte3@cs.umbc.edu wrote:
> assoc.pl - that's what I'm looking for.

perhaps. Another possibility would be the fsa_hash.pl library (+related
variants) that comes with my Fsa utilities package. Depending on how
you want to use the hash-like datastructure this might be *much faster*
(or much slower...).

Gertjan

--
Gertjan van Noord Alfa-informatica, RUG, Postbus 716, 9700 AS Groningen
vannoord at let dot rug dot nl http://www.let.rug.nl/~vannoord

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