Hi Philippe,
counting ones in BoolVar arrays is the same as the sum over the array, so just
use linear with BoolVar arguments.
Cheers,
Guido
On 06/08/2013, at 11:46 PM, Philippe <aqwzsxaqw...@orange.fr> wrote:
> Hello Everybody,
>
> I need to count the number of 'true' values stored in a BoolVarArray
> (accessed through a Matrix<BoolVarArgs>). However, the counting constraint
> (as described page 63 of gecode 4.2.0 manual) only takes integer variables.
> Thus, the following pseudo-code doesn't work :
>
> BoolVarArray _FPR(*this, _Na, _Ne);
> IntVarArray _NFPR(*this, _Na);
> Matrix<BoolVarArgs> fpr(_FPR, _Na, _Ne);
>
> for(int i = 0 ; i < _Na ; ++i)
> {
> // after count's call,
> // _NFPR[i] = number of 'true' in fpr.row(i)
> count(*this, fpr.row(i), true, IRT_EQ, _NFPR[i]);
> }
>
>
> 1) What is the reason to forbide BoolVar in count ?
>
> 2) Is it legal (don't think so) to write :
>
> Matrix<IntVarArgs> fpr(_FPR, _Na, _Ne);
>
> for(int i = 0 ; i < _Na ; ++i)
> count(*this, fpr.row(i), 1, IRT_EQ, _NFPR[i]);
>
> 3) Or do I need to replace fpr's definition by :
>
> Matrix<IntVarArgs> fpr(_FPR, _Na, _Ne);
>
> 4) Or, do I need to use channeling ?
> But i don't find the way to express it
> It seems that the tips page 67 is not relevant here.
> help please !
>
> 5) Or something else ?
>
> Thanks for any help,
> Philippe
>
>
>
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