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Re: [Help-glpk] RE: Help-glpk Digest, Vol 22, Issue 12
From: |
Michael Hennebry |
Subject: |
Re: [Help-glpk] RE: Help-glpk Digest, Vol 22, Issue 12 |
Date: |
Mon, 20 Sep 2004 09:20:42 -0500 (CDT) |
On Mon, 20 Sep 2004, Q Wu wrote:
> I'm new to learn GLPK to solve LP problem, I have a simple model for Map
> Coloring problem as below, but when I tried to solve it, I got the following
> parse error at line 12#: argument for abs has invalid type. I'm very
> confused with this error.
The phrasing is a bit confusing.
The distinction is not between integer and real,
It's between constant and not constant.
abs(linear non-constant function) >= 1 is a nonlinear constraint.
> And, I'm also wondering why strict inequality is not allowed in the model.
> Can anyone give some explanation? Thanks for any input in advance.
Open sets lead to optimization problems with no optimum solution.
--
Mike address@hidden
"Nothing says it like words if you know how to use them."
-- the Professional Organization of English Majors