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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:*
>
>*??? *** 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?*
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