[gecode-users] How to write with Gecode a constraint similar to distinct but with absolute value of values : distinct ( |variables|).

[Vijay Saraswat]

Use a view on the integer variables?

On 10/25/14, 5:25 AM, Bouchene Sabrina wrote:
> Hi,
>
> I want to use "alldifferent" constraint or a "distinct" constraint but 
> in my case, i have a matrix M and i would that the elements (values) 
> of the row of a matrix be different, but the variables of the row can 
> have positive and negative values, so i would have a constraint that 
> for example:
>
> if row = 1 thenthe absolute values of M[1, j] could be all different, 
> that means, if i have M[1,1]=(-3), i should not get M[1,j] =(+3) for j 
> =1 to n. so in the same row or in the same column if i have (val) i 
> must not have (-val) or if i have (-val) i mast not have (val).
>
> alldifferent (|M[i, j]|).
>
> My question is how to write this constraint in Gecode ?.
> I hope my question was clear.
>
> Best regards. Sabrina
>
>
>
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