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Re: [Help-glpk] invalid scale factor

From: Andrew Makhorin
Subject: Re: [Help-glpk] invalid scale factor
Date: Thu, 8 Jul 2004 02:22:38 +0400

>I have a quite big MIP problem with about 900 integer variables.
>Trying to optimize with glpk I get the following message:
>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?

Looks like there is a bug in some glpk mex interface routine (the
first error message comes from glpk mex, not from glpk). The error
appears because some glpk mex routine tries to set element R[5,5] of
the diagonal scaling matrix (used internally to scale rows) to zero,
however, all scale factors must be positive numbers.

Andrew Makhorin

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