[Coin-discuss] GLPK AND SYMPHONY not getting the same solutions

[Ted Ralphs]

Michael Hennebry wrote:
> On Wed, 19 Oct 2005, Ted Ralphs wrote:
> 
> 
>>Under the heading "BOUNDS Section" and the subheading "Default Bounds,"
>>the OSL manual says the following:
>>
>>"For integer variables, the default bounds on columns are 0 and 1.
>>(WARNING, if you want a very large bound for an integer variable,
>>explicitly set it to 1020. DO NOT specify a value larger than 1020, or
>>leave the value unspecified, thinking that the result will be "unbounded.")"
> 
> 
> This strikes me as a strange thing to do.
> Does this mean that 1020 is the largest integer upper bound
> one can set or that 1020 is replaced by +infinity?
> 
> Presumably if one had some integer variables bounded by 1020 and
> others bounded by 1021 one would have to introduce explicit rows.

Oops! Sorry for the confusion---this read 10^20, not 1020, in the
original document. I didn't notice the error when I posted originally.

Ted
-- 
Dr. Ted Ralphs
Assistant Professor
Industrial and Systems Engineering
Lehigh University
(610)758-4784
tkralphs at lehigh.edu
www.lehigh.edu/~tkr2