[eclipse-clp-users] eplex: Unable to linearise / type error

From: Ulrich Scholz <Ulrich.Scholz_at_...10...>
Date: Wed, 10 Sep 2008 16:34:30 +0200
Dear all,

I try to write a CP problem with the eplex constraint solver.  Below you
find my code.

I use decision variables to select one of a list of values.  On the call

  :- generateSubcomponents(3, S). 

I get the following error:

Eplex warning: Unable to linearise my_instance : Utility =:= [3, 1, 6] * [_184, _186, _188]
type error in eplex : (my_instance : Utility =:= [3, 1, 6] * [_184, _186, _188])
Abort

What to do?  

Is it a problem of my use of decision variables?  How to find an optimal
solution in a discrete CSP?


Thanks,

Ulrich

------------
:- lib(eplex_osi_clpcbc).
:- eplex_instance(my_instance).

generateSubcomponent(NbImplementation, Subcomponent) :-

    % the decision variables
    
    length(DVs, NbImplementation),
    my_instance: (DVs $:: 0..1),
    my_instance: integers(DVs),
    
    % the utilities
    
    length(Utilities, NbImplementation),
    
    (foreach(Utility, Utilities)
    do(
          % results in an random Integer in the range [1, 8]
          generateNoZeroRandom(8, Utility)
      )
    ),
    
    my_instance: Utility $= Utilities * DVs,
    
    Subcomponent = [Utility, DVs, Utilities].
--------------

-- 
Ulrich Scholz            

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Email: ulrich.scholz at eml-d.villa-bosch.de

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Received on Wed Sep 10 2008 - 07:31:48 CEST

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