Re: Solver, MILP and Boolean constraints

[Jean Bréfort <jean brefort normalesup org>]

It might be a bug. Can you join your file?

Le lundi 18 octobre 2004 à 15:52 +0200, Massi A Milani a écrit :
> Thank you very much for your clarification.
> I am sorry that I was not too much clear on the issue.
>
> The reason I have sent the email to the list is exactly the following
> Cells in my problem (T2:T204) are in the "By changing cells" entry.
> Therefore, Gnumeric should not give me that message.
>
> Massi
>
>
> On Mon, 18 Oct 2004 15:44:02 +0200, Jean Bréfort
> <jean brefort normalesup org> wrote:
> > Le samedi 16 octobre 2004 à 14:16 +0000, Massi a écrit :
> >
> >
> > > Hi guys,
> > >
> > > I am running a MILP problem with Gnumeric 1.2.13.
> > > The Solver of Gnumeric is able to solve it in less than 1 second, 5
> > > time faster than Excel. However, introducing a Boolean constraint
> > > (i.e. modifiable cells can only assume a binary value, 0 or 1), I get
> > > the following message
> > >
> > > Constraint `T2:T204 Bool ' is for a cell that is not an input cell
> > >
> > > Since the Handbook of Gnumeric does not actually specify how to input
> > > a binary constraint, I included it as I usually do in Excel.
> > > I am just wondering whether I made a mistake or Boolean constraints do
> > > not work properly.
> > >
> > > I would really appreciated your help.
> > > Massi
> > >
> > > PS: I have been pretty happy to notice that Gnumeric does not have the
> > > 200-constraint limit as Excel does. Good job, guys!
> >
> > The cell for which you add a constraint must be an input cell of the
> > problem. In other words, it must already be listed in the "By Changing
> > Cells" entry.