Re: [eclipse-clp-users] Getting legaly named variables / Unifiying Term Lists

From: Joachim Schimpf <joachim.schimpf_at_...44...>
Date: Fri, 12 Feb 2010 16:14:35 +1100
Christian Wirth wrote:
> Ok, sorry for writing not more, but thought yesterday i have now 
> completed the current feature (except the small problem) ... but after 
> sleeping a night over it, i think i must possibly change something 
> somewhere else.
> 
> Here now the complete problem:
> 
> I have term's in CNF that i split up according to some predicates. The 
> splitted clauses are added to lists, but this must happen without prolog 
> trying to bind the variables.
> So i decided to convert the terms into strings bevor adding, to prevent 
> the binding. As several times mentioned, i need to preserve variable 
> names/numbers exactly.

Hi Christian,

you are really going down a wrong track here.  You will save yourself a
lot of frustration and unnecessary work if you take a step back, and think
about what you are really doing here.  I think the questions that Stefan
Schiffel (whose code you seem to be using) asked earlier, seriously need
to be answered before you do any more coding!

As far as I understand, Stefan's code is designed to work with ground
states, that's why his use of findall's makes sense.  You try to use
it in a different way, which as you notice, doesn't work.

Can we come up with a very small example (not involving gdl etc) that
demonstrates what kind of result you want to achieve when you evaluate
a move starting from a nonground state?

It seems to me that the whole idea of collecting all solutions does not
make much sense when you don't start from a fixed given state.  If you
don't know the starting location, you will have thousands of possible
moves.  Constraint programming looks like right tool to deal with this
(by constraining the possible moves and by working with an implicit
representation of the space of alternative outcomes) but it requires
a different way of modelling the problem.  Anyway, as I'd like to see
a successful Eclipse application coming out of this, I'd be happy to
make suggestions.  But seriously, don't waste any more time trying
to abuse variable names!


Cheers,
Joachim
Received on Fri Feb 12 2010 - 05:13:44 CET

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