Re: [Help-glpk] numerical instability

[Michael Hennebry]

On Fri, 8 Jul 2011, Akhil langer wrote:

> Andrew,
>
> Thanks, Andrew. The NaN problem has been resolved. However, I keep getting
> the following warning:
>
> Warning: numerical instability (primal simplex, phase I)
>
> Please note that I have been using INT_MAX as the upper bound for some
> columns. Could that be the cause of the instability? I can change these
> columns also to be free but that would require some changes in the code.
> Just wanted to check with you if changing the code will remove the
> instability?

That is still rather large.
I'd bite the bullet and make the code changes.
In the alternative, find sensible bounds.

--
Michael   address@hidden
"Pessimist: The glass is half empty.
Optimist:   The glass is half full.
Engineer:   The glass is twice as big as it needs to be."