Re: [eclipse-clp-users] Propagate and not resolve a problème

From: Kish Shen <kisshen_at_...5...>
Date: Wed, 03 Feb 2010 14:41:17 +0000
mdjefel wrote:
> Hi every body,
> 
> I know that ECliPSe is a tool to resolve problem. But I want to just 
> propagate constraints and to return the reduction of domain's variables.
> How can I do that.
> Thanks in advance for you answers.
> 
> Mériem
> 
Hi Mériem,

ECLiPSe is a programming language which includes libraries that support 
constraint programming in various domains, with various solving methods.

Constraint propagation is used as the reasoning method in some of the 
constraint libraries supported by ECLiPSe, e.g. ic, mentioned by Wit's 
reply to your original post. Note that with constraint propagation as 
your solving method, the propagation is normally not sufficient to solve 
a problem (i.e. find values for all problem variables consistent with 
the constraints), and you need to write extra code to solve the problem, 
perhaps by doing search, and this is not really part of the constraint 
library.

In ic, there is also generally no guarantee on the level of consistency 
achieved by the propagations, unless it is specifically stated otherwise 
in the manual. If your interest is in seeing how much domain reduction 
can be achieved with a certain level of consistency, then ic is probably 
not what you want. You may want to look at the propia library instead:

http://www.eclipse-clp.org/doc/libman/libman038.html

Cheers,

Kish

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Received on Wed Feb 03 2010 - 14:41:30 CET

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