sci.op-research

On Mar 25, 10:11=A0am, Horand.Gassm...@googlemail.com wrote:
> On Mar 24, 8:23=A0pm, Peter wrote:
>
>
>
>
>
> > I have an optimization problem, where I want to minimize the objective
> > function. On the other hand I need to have a constraint which says
> > that optimal value of the objective function should be greater than or
> > equal to a specific value:
>
> > min z
> > s.t.
> > [some other constraints]
> > z_min >=3D k
>
> > where, k is a scalar, and z_min is the optimal value of the objective
> > function for the problem below:
>
> > min z
> > s.t.
> > [some other constraints]
>
> > Does anybody have an idea for formulating this problem?
>
> min z
> s.t.
> [some other constraints]
> z >=3D k- Hide quoted text -
>
> - Show quoted text -

This does not work. Because the constraint z <=3D k interfers with
minimizing z. The solver just tries to statisfy z<=3Dk by minimizing z.