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Re[2]: [Help-glpk] LPP & MIP

From: Richard Prescott
Subject: Re[2]: [Help-glpk] LPP & MIP
Date: Fri, 30 Jul 2004 22:19:29 -0400 (EDT)

Unfortunately, I don't understand why integer row singleton cannot be eliminated. It might (in part) explain why the attached file doesn't work (yet). (I began to wrote a longer email then I wanted to verify my assumptions then I wrote this piece of code then time goes so fast...)



On Sat, 31 Jul 2004, Andrew Makhorin wrote:

Is there any good reason why LPP isn't used for lpx_integer() ?

LPP cannot presolve mip's, because it knows nothing about integer
variables (for example, elimination of a row singleton must not be
used if corresponding variable is of integer kind, etc.).

There must be IPP, however, no one has written/contributed it yet :+)

Attachment: miplpp.c
Description: Text document

Attachment: bpp25.mod
Description: Text document

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