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Re: [Help-glpk] invalid scale factor

From: Michael Hennebry
Subject: Re: [Help-glpk] invalid scale factor
Date: Wed, 7 Jul 2004 14:40:14 -0500 (CDT)

On Wed, 7 Jul 2004, Kümmel, Anne wrote:

> I have a quite big MIP problem with about 900 integer variables. Trying to 
> optimize with glpk I get the following message:
> ??? *** SEVERE CRITICAL ERROR *** from GLPK !
> lpx_set_rii: i = 5; rii = 0; invalid scale factor
> As I am not very familiar with MIP algorithms, can somebody explain what 
> exactly is going wrong here?

Not for sure.
I suspect an ill-conditioned matrix.
By any chance, is this a big-M formulation?

Mike   address@hidden
"Nothing says it like words if you know how to use them."
                    --  the Professional Organization of English Majors

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