Originally posted by: LRAU

Hello,

I'm using CPlex and Java to implement a MILP. However, when I try to run the programm, I get the following error message:
Bound infeasability column 'IloX78'.
Presolve time = 0.00 sec.
I have no idea what this error message means, I cannot find anything concerning that topic in the reference manual. I don't even know how to find out which column is meant by column'IloX78'.
Can anybody help me with that?

Thanks
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Originally posted by: SystemAdmin

> LRAU wrote:
> Bound infeasability column 'IloX78'.
> Presolve time = 0.00 sec.
> I have no idea what this error message means, I cannot find anything concerning that topic in the reference manual..

I think it means that the presolver determined that some combination of constraints and bounds implies that IloX78 would have to take a value violating one of its bounds. In other words, your model is infeasible (or at least the presolver thinks it is).

> I don't even know how to find out which column is meant by column'IloX78'.
> Can anybody help me with that?

You can assign names to variables, constraints, objective functions and pretty much anything in a model. Typically the constructors have versions that include a string argument for the name. Alternatively, after you've declared an object, you can invoke its setName method and tack on a name that way. Once you've assigned names that are meaningful to you, the error message will use your assigned name.

Paul

Mathematicians are like Frenchmen: whenever you say something to them, they translate it into their own language, and at once it is something entirely different. (Goethe)
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Originally posted by: LRAU

Hello Paul,

thank you very much! Assigning names has proved to be very helpful!
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