Re: fd_set_vector_max: misunderstanding or bug?

[Lars Frantzen]

To clarify, I mean the unstable version of gprolog (see
homepage). Compiling is no problem under Ubuntu.

Cheers,
Lars

On Thu, 17 May 2007 11:03:11 +0200
Lars Frantzen <address@hidden> wrote:

> Hi Dirk,
> 
> just a general comment here, I had similar problems with fd_set_vector_max
> on a 64bit Ubuntu 6.1.0 and gprolog 1.3.0. For instance
> 
> test(A,B,C) :- 
>       A #=# 24,
>       B #=<# 44,
>       C #=# A*B,
>       fd_labeling([A,B,C]).
> 
> did not report all the solutons it should. I then tried the unstable
> version and there it works fine.
> 
> Cheers,
> Lars
> 
> 
> On Thu, 19 Apr 2007 14:51:06 +0200
> "Dirk Koschützki" <address@hidden> wrote:
> 
> > Hello,
> > 
> > I have sent the following mail yesterday but it did non appear in the
> > archive, therefore I resend it.
> > 
> > Let me add that the barrier for working/non-working is 1728/1727. With
> > the larger value the computation leads to the correct result.
> > Interestingly, if I increase the value from 500 in steps to 1728 then
> > the number of solutions found increses until the correct value is
> > reached, too.
> > 
> > Cheers,
> > Dirk
> > 
> > --- Yesterdays mail ---
> > 
> > i have a problem with the function fd_set_vector_max. My CSP needs
> > four variables (A-D) with are constrained to take values from 0 to
> > 563. If I set the fd_set_vector_max value to 564, then the system
> > finds only about 3000 solutions. If I increase fd_set_vector_max
> > dramatically, e.g. to 5640, then all solutions (>160000) are found.
> > 
> > I checked with a different method that the >160000 solutions are correct.
> > 
> > Please run the attached file and change the lines marked
> > "Fails"/"Works" to see the effect.
> > 
> > My question is: Is this a misunderstanding of fd_set_vector_max, my
> > values are 0--N, therefore using N+1 should be ok, or is it a bug in
> > the implementation?
> > 
> > Please contact me for further questions.
> > 
> > Cheers,
> > Dirk
> > 
> > 
> > 
> > This is my configuration:
> > 
> > Running on Ubuntu 6.10 with the provided gprolog packages.
> > 
> > Linux nw-08 2.6.17-11-generic #2 SMP Tue Mar 13 23:32:38 UTC 2007 i686 
> > GNU/Linux
> > 
> > Prolog top-Level (GNU Prolog) 1.2.18
> > By Daniel Diaz
> > Copyright (C) 1999-2004 Daniel Diaz
> > GNU Prolog comes with ABSOLUTELY NO WARRANTY.
> > You may redistribute copies of GNU Prolog
> > under the terms of the GNU General Public License.
> > For more information about these matters, see the files named COPYING.
> > 
> > configure options are not available.
> > 
> > $gprolog
> > [example].
> > 
> 
> 
> -- 
> Lars Frantzen
> http://www.cs.ru.nl/~lf/
> 
> 
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-- 
Lars Frantzen
http://www.cs.ru.nl/~lf/