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Re: [Fwd: Integer solutions]
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From: |
Michael Hennebry |
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Subject: |
Re: [Fwd: Integer solutions] |
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Date: |
Wed, 18 Jan 2023 12:58:52 -0600 (CST) |
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User-agent: |
Alpine 2.21 (DEB 202 2017-01-01) |
On Wed, 18 Jan 2023, Andrew Makhorin wrote:
-------- Forwarded Message --------
Date: Tue, 17 Jan 2023 20:33:01 -0800
Subject: Integer solutions
To: 'Help-glpk@gnu.org' <help-glpk@gnu.org>
From: neillclift@gmail.com
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If I call glp_simplex without specifying that any variables be
integers and then call glp_intop it looks like it at least makes the
objective function an integer.
IIRC that is not how gpl_intop is supposed to work.
In any case, why are you calling glp_intop.
case first would be faster. Likewise I determine feasibility of a
system of inequalities with a zero objective and want to do this in
both reals and then integers.
I try to avoid a zero objective if I can.
The solver's selection mechanisms will encounter a lot of ties.
Of course 'tis possibe that GLPK has mechaanisms
specificaly for a zero objective.
Perhaps Andrew will tell us.
--
Michael hennebry@mail.cs.ndsu.NoDak.edu
"Occasionally irrational explanations are required" -- Luke Roman