Re: A small problem about PROLOG.

On 3/09/2013, at 1:07 AM, pdos_96 wrote:
> 
> I was doing a PROLOG program in which part of the data is very
> time-consuming calculations. So I think now it is cached.
> But I'm looking for the corresponding function did not find the
> appropriate function.

*What* Prolog program?
What do you mean part of the *data* (the words and numbers *given*
to you, "do, dare, dedi, datum; the Latin verb 'to give'") is
*calculations*?
*What* calculations?
Now you think *what* is cached?
Cached *where*?
Cached *by what*?
"Corresponding function": function corresponding to *what*?
> 
> I need to term and cache data binding.

I have a suspicion that you are asking for a "weak hash table",
which Prolog doesn't actually have.

> assert does not comply with my request, because I saved this forever.
> recordz need a KEY, KEY and this can not be a term.

The key given to recordz *must* be a term; there is nothing else
for a data value in Prolog to be. To be an argument of a predicate
is to be a term.
> 
> So I now how to do it?

Do *what*?

You haven't told us anything whatever about the nature of your
calculations.  The odds are high that that a straightforward
reorganisation of the way the data flow will be sufficient to
obtain adequate performance, and that the programming principles
required will be language-independent.

Just yesterday I spent an hour explaining to a student how an
order N**2 query could be reorganised to be order N.  The
language he was using wasn't Prolog, and the technique was
entirely language-independent.

Can you describe what the calculations are *without* using any
programming language?