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

From: Andrew Makhorin
Subject: Re: [Help-glpk] Error: multiplication of linear forms not allowed
Date: Sun, 19 Jun 2011 20:11:28 +0400

> How do we solve Integer Linear Programming formulations of the
> Travelling Salesman Problem as in this URL
> 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?
> There are a whole lot of decision problems where we either need to
> pick something or leave something, almost always represented by a
> boolean integer multiplied with its actual quantitative value.

Check that in your model objective coefficients are parameters, not

You also may look at a similar example model tsp.mod included in the
glpk distribution (see subdirectory examples).

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