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Re: [Help-glpk] [Fwd: Re: [Fwd: Find nearest point]]
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From: |
Michael Hennebry |
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Subject: |
Re: [Help-glpk] [Fwd: Re: [Fwd: Find nearest point]] |
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Date: |
Wed, 15 Jun 2011 22:07:28 -0500 (CDT) |
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User-agent: |
Alpine 1.00 (DEB 882 2007-12-20) |
On Thu, 16 Jun 2011, Andrew Makhorin wrote:
-------- Forwarded Message --------
From: Paul Chavent <address@hidden>
To: glpk xypron <address@hidden>
Cc: Andrew Makhorin <address@hidden>, address@hidden
Subject: Re: [Help-glpk] [Fwd: Find nearest point]
Date: Wed, 15 Jun 2011 22:17:03 +0200
It works with a smallest value !
In the wikibook there is a paragraph on "scaling". Is it the same issue that
the choice of the big M ?
It's related, but not the same.
Polytopes produced by different scalings
are linear transforms of each other.
Polytopes produced by different big M's are not.
Decreasing a big M will shrink a polytope.
--
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."