[gecode-users] Conditional constraints ?

[Wajid Hassan]

Hi Guido,

Thank you for the reply.

*// That is what the element constraint is used for (you'll find it in the
documentation).  It works directly on variables, so you don't have to solve
the sub-problem on x first.*

I am not sure I follow your point. Let me clarify the question, there are
two integer variable arrays Array1[] and Array2[]. Both the arrays are
constrained in different ways individually. Then, as a last constraint
Array1[] needs to be constrained using the values assigned to Array2[]. So,
do u think the following constraint would work or not?

rel(*this, Array2[Array1[some_index].val()] + (something) <=
Array2[another_index]);


It doesn't give any errors on compilation but I haven't finished the rest
of the model yet to be 100% sure if it works correctly or not.

Thank you in advance.

Best regards,
Wajid

On Mon, Feb 20, 2012 at 11:04 PM, Guido Tack <tack at gecode.org> wrote:

> On 21 Feb 2012, at 08:33, Wajid Hassan wrote:
>
> Hi Christian,
>
> The problem in a nut shell is:
>
> I have two arrays of integer variables, Array1[x] and Array2[x]. I want to
> use the value assigned to the variables in Array1[] as an index of
> Array2[], something like this:
>
> rel(*this, Array2[Array1[x].val()] + (something) <= Array2[x+1]);
>
> Is there anything wrong with the above constraint or should this work?
>
>
> That is what the element constraint is used for (you'll find it in the
> documentation).  It works directly on variables, so you don't have to solve
> the sub-problem on x first.
>
> Cheers,
> Guido
>
> --
> Guido Tack,
> http://www.csse.monash.edu/~guidot/
>
>
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