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Re: fd_set_vector_max: misunderstanding or bug?


From: Lars Frantzen
Subject: Re: fd_set_vector_max: misunderstanding or bug?
Date: Thu, 17 May 2007 11:03:11 +0200

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 Kosch├╝tzki" <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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