Re: [Choco-users] maximize/minimize

[<fra...@ya...>]

Hi Rémi,

first of all, we encoded the simple APIs for
optimisation (Michel was asking about them) yesterday.
They should be published anytime, as soon as a new
version (0.91 ?) is released (Guillaume, can you
please do it ?)

Concerning the example that you mention, it seems to
work perfectly:
you want to optimize v1+v2+v3 and you assign values by
decreasing order, so the first solution found is the
optimal: v1,v2,v3 are all set to the maximum of their
domain, which is 10.
I do not see what is wrong.

François

 --- coletta <co...@li...> a écrit : 
> Le lun, 25/10/2004 à 14:08 +0200, Hadrien Cambazard
> a écrit :
> 
> > The api concerning minization and maximization in
> not yet available on the
> > Problem object. However, you can look at the
> following code which give you
> > an example of minimization. You only need to use
> the Solver object and
> > specify a couple of options :
> > 
> > public static void main(String[] args) {
> >     Problem pb = new Problem();
> >     IntVar fctObj =
> pb.makeBoundIntVar("objectif",-10,1000);
> >     IntVar v1 = pb.makeEnumIntVar("v1",1,10);
> >     IntVar v2 = pb.makeEnumIntVar("v2",-3,10);
> >     IntVar v3 = pb.makeEnumIntVar("v3",1,10);
> > 
> >     pb.post(pb.eq(pb.sum(new
> IntVar[]{v1,v2,v3}),fctObj));
> > 
> > 
> >     Solver solver = pb.getSolver();
> >     solver.setDoMaximize(false);
> >     solver.setObjective(fctObj);
> >     solver.setRestart(false);
> >     solver.setFirstSolution(true);
> >     solver.generateSearchSolver(pb);
> >     solver.launch();
> >   }
> 
> Hello guys,
> 
>   I'm sorry, but i don't seem to work :-(
>   By selecting another Value Ordering, for instance:
> inserting the line "solver.setValIterator(new
> DecreasingDomain());",
> i obtain:
> 
> $ java Test
> ... solution with cost objectif:30
> Pb[4 vars, 1 cons]
> objectif[30, 30]
> v1{10}
> v2{10}
> v3{10}
> 
> Do i miss something ?
> 
> --
> Rémi 
> 
> 
> 
>
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