Re: [eclipse-users] Finite set of possibilities in an underconstrained equation

From: Joachim Schimpf (Independent Contractor) <jschimpf_at_...5...>
Date: Wed, 08 Aug 2007 12:50:18 +0100
Vivek Balaraman wrote:
> Given an IC constraint
>  
> A #= B * C
> where
> A #::[0..50],
> B #::[0..5],
> C#::[0..10]
>  
> (var(A)->indomain(A);true),
> (var(B)->indomain(B);true),
> (var(C)->indomain(C);true).

You don't need the var tests, and you can use labeling/1 instead of
a sequence of indomains.

>  
> When any two of A,B,C are grounded, then there is no problem. However, 
> there may be times when only one of these is grounded (say C has the 
> value 5. What we want is to be able to generate all possible solutions 
> by labeling the other two variables. However I get a type error when I 
> try to do so.

What you describe just works:

?- A #:: [0..50], B #:: [0..5], C #:: [0..10], A #= B*C, labeling([A,B,C]).
A = 0
B = 0
C = 0
Yes (0.00s cpu, solution 1, maybe more)

...

A = 50
B = 5
C = 10
Yes (0.20s cpu, solution 66)


If you still have a problem, show us your exact code.


-- Joachim
Received on Wed Aug 08 2007 - 12:50:32 CEST

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