Re: [eclipse-clp-users] eplex vs ic

From: Bogdan Tanasa <g-bogta_at_...107...>
Date: Sun, 2 Oct 2011 01:49:26 +0200
I understand. Other reasons?

Sent from my iPhone

On 01.10.2011, at 15:36, Sergey Dymchenko <kit1980@...6...> wrote:

> Hello!
> 
> I think the difference is because eplex works for linear constraints
> only, and ic works for non-linear constraints too. So we have more
> effective for one task tool and more universal tool.
> 
> To highlight limitations of ic library, here is an example from the
> book "Constraint Logic Programming using Eclipse" by Krzysztof R. Apt,
> Mark Wallace:
> 
> incons(W, X, Y, Z) :-
>  W+X+Y+Z $>= 10,
>  W+X+Y $= 5,
>  Z $=< 4.
> 
> incons(W, X, Y, Z) should always fail, but ic library can't find
> inconsistency via constraint propagation, while eplex finds the
> inconsistency.
> 
> 
> Sergey.
> 
> On Sat, Oct 1, 2011 at 3:19 PM, Bogdan Tanasa <g-bogta@...107...> wrote:
>> Hi,
>> 
>> 
>> 
>> I have implemented a clp formulation for solving some linear constraints. I
>> am using eplex and also the ic library. There are huge differences in terms
>> of running time. I am sure this question was putted for some many times but
>> can one explain to me what are the reasons for this to happen?
>> 
>> 
>> 
>> Best regards,
>> 
>> Bogdan.
>> 
>> 
>> 
>> 
>> 
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Received on Sat Oct 01 2011 - 23:52:59 CEST

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