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## Re: [Help-glpk] Error: multiplication of linear forms not allowed

**From**: |
Michael Hennebry |

**Subject**: |
Re: [Help-glpk] Error: multiplication of linear forms not allowed |

**Date**: |
Sun, 19 Jun 2011 10:47:11 -0500 (CDT) |

**User-agent**: |
Alpine 1.00 (DEB 882 2007-12-20) |

On Sun, 19 Jun 2011, Sarad AV wrote:

How do we solve Integer Linear Programming formulations of the Travelling
Salesman Problem as in this URL
http://support.sas.com/documentation/cdl/en/ormpug/63352/HTML/default/viewer.htm#ormpug_milpsolver_sect020.htm
where there is a multiplication operator in the Objective function.
glpsol complains " multiplication of linear forms not allowed".
Is there an easy fix to this?

My guess is that for some reason glpsol thinks
c is variables instead of constants.
That is what needs fixing.
--
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."