[Couenne] Objective fn value

[Pietro Belotti]

Akshay,

it seems this might be related to a constant value of the objective 
function, i.e., after some AMPL preprocessing the problem is of the form 
min {c: x in X}, with c a constant.

I'll submit a ticket. I was able to create a problem that replicates the 
behavior you describe, but can you attach a model where this happens?

Thanks,
Pietro

--
Pietro Belotti
Dept. of Mathematical Sciences
Clemson University
email: pbelott at clemson.edu
phone: 864-656-6765
web:   myweb.clemson.edu/~pbelott

On Wed, 24 Aug 2011, Akshay Gupte wrote:

> Hi
> I am using the stable 0.4 version. I noticed that after Couenne finished 
> it's solve, the optimal (or best found) value displayed by Couenne is 
> completely different from the value using the foll. command in Ampl
>
> display obj.val;
>
> This happened for many instances that I was trying. In some cases, the 
> value displayed from within Ampl was simply zero. Is it possible that 
> the link with Ampl is broken somewhere ?
>
> Akshay Gupte
>
> Sent from my iPhone
>
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