[Cbc] lp file format

[Bjørn Sigurd Johansen (Spider Solutions AS)]

Thx  : )

Three modelling questions:


Question 1:  Is there any advantage in defining bounds in BOUNDS section rather than in SUBJECT TO section?  I.e. is one of the following preferred for an (integer and/or continuous) variable?

SUBJECT TO
I1>=0
I1<=10
------------------------- alternatively -------------------------
BOUNDS
0 <= I1 <= 10



Question 2:  What is/is there any purpose of defining no bounds, i.e. using FREE in BOUNDS section, for integer variables?

BOUNDS
I1 FREE
GENERAL
I1
------------------------- alternatively only -------------------------
GENERAL
I1



Question 3:  Is there any difference between the following two?
V1>=0
V1>=+0
(I have seen “+0” being used several places).



Thanks in advance,
Bjorn



From: Haroldo Santos [mailto:haroldo.santos at gmail.com]
Sent: mandag 13. november 2017 13:03
To: Bjørn Sigurd Johansen (Spider Solutions AS) <bjorn.sigurd.johansen at spidersolutions.no>
Cc: cbc at list.coin-or.org; cbc at coin-or.org
Subject: Re: [Cbc] lp file format

Hi,

I think that there is no cbc specific (more precisely Osi) LP format documentation. The LP file format was introduced in CPLEX and I think that CPLEX has the official documentation.



On Mon, Nov 13, 2017 at 5:54 AM, Bjørn Sigurd Johansen (Spider Solutions AS) <bjorn.sigurd.johansen at spidersolutions.no<mailto:bjorn.sigurd.johansen at spidersolutions.no>> wrote:
Hi!

Is there any description on the CBC lp file format available ?

Or may the Cplex format description at http://lpsolve.sourceforge.net/5.0/CPLEX-format.htm be used ?

Best,
Bjorn

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Haroldo Gambini Santos
Computing Department
Universidade Federal de Ouro Preto - UFOP
email: haroldo [at ] iceb.ufop.br<http://iceb.ufop.br>
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