sh.mojtahedzadeh@[EMAIL PROTECTED]
wrote:
> I wanted to ask you if you know how can I write a mixed integer model
> in Lindo?
>
> In my model, I want to select the best suppliers and assign the
> optimum order quantity to them. I defined Xi as the optimum order
> quantity to each and Yi=0 or 1 . So, if Yi is 1 then there is an Xi>=0
> and if Yi=0 then that supplier is not selected.
If X is the quantity, what sense does it make to allow X to be negative
anyway? Won't there _always_ be X greater than _or equal to_ zero?
This is a tool for solving systems of equations, right? Can't you add
constraints that X be non-negative and dispense with Y altogether?
> Lindo does not accept combinations with multiplication such as X1*Y1
Since your question seems to be entirely about how to use Lindo, and
nothing to do with how to use it specifically with Delphi, I suggest you
go ask on a Lindo sup****t forum. There you'll get lots of people who
know Lindo, or at least a few people who know it well.
I see Lindo mentioned a few times on sci.op-research.
--
Rob
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