<br><font size=2 face="sans-serif">Matt,</font>
<br>
<br><font size=2 face="sans-serif">We accept BV and UI. Not sure
we can accept SC as no OsiSolverInterface definition. I would like
to be able to accept S1 and S2 sets if we decide to extend to SC.</font>
<br>
<br><font size=2 face="sans-serif">May get round to putting in LI if noone
else does first.</font>
<br>
<br><font size=2 face="sans-serif">John</font>
<br>
<br>
<br>
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<tr valign=top>
<td width=40%><font size=1 face="sans-serif"><b>Matthew Saltzman <mjs@ces.clemson.edu></b>
</font>
<br><font size=1 face="sans-serif">Sent by: coin-discuss-bounces@list.coin-or.org</font>
<p><font size=1 face="sans-serif">04/19/2006 08:47 AM</font>
<table border>
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<td bgcolor=white>
<div align=center><font size=1 face="sans-serif">Please respond to<br>
Discussions about open source software for Operations Research
<coin-discuss@list.coin-or.org></font></div></table>
<br>
<td width=59%>
<table width=100%>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">Discussions about open source software
for Operations Research <coin-discuss@list.coin-or.org></font>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
<td>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [Coin-discuss] problem with initialsolve</font></table>
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<td>
<td></table>
<br></table>
<br>
<br>
<br><tt><font size=2>On Wed, 19 Apr 2006, John J Forrest wrote:<br>
<br>
> Anureet,<br>
><br>
> Cplex seems to accept a non standard MPS format bound. There
are LI bounds<br>
> which I have never heard of (they obviously allow a lower bound of
minus<br>
> infinity). The Mps standard is MI and when I changed them to
that then the<br>
> problem was feasible.<br>
><br>
> CoinMpsIo should have given error messages on unrecognized bound types
- I<br>
> think I have corrected that.<br>
<br>
These are part of CPLEX's and other solvers' integer extensions--an <br>
alternative to the MARKER format.<br>
<br>
LI is CPLEX-speak for a variable that must be integer and has the <br>
specified lower bound. UI is integer with specified upper found,
BV is <br>
binary, SC is semi-continuous with given upper bound (presumably the lower
<br>
bound must be specified with an LB).<br>
<br>
I think we probably want to accept these extensions. There are other CPLEX
<br>
extensions that may be more or less common that we may want to consider
<br>
supporting in the future.<br>
<br>
<br>
Matt<br>
<br>
><br>
> John Forrest<br>
><br>
><br>
><br>
> Anureet Saxena<br>
> <anureet@yahoo.co<br>
> m>
To<br>
> Sent by:
coin-discuss@list.coin-or.org,<br>
> coin-discuss-boun
anureet@cmu.edu<br>
> ces@list.coin-or.
cc<br>
> org<br>
>
Subject<br>
>
[Coin-discuss]
problem with<br>
> 04/11/06 12:50 PM
initialsolve<br>
><br>
><br>
> Please respond to<br>
> Discussions about<br>
> open source<br>
> software for<br>
> Operations<br>
> Research<br>
> <coin-discuss@lis<br>
> t.coin-or.org><br>
><br>
><br>
><br>
><br>
><br>
><br>
> hi,<br>
><br>
> I am trying to solve a linear program by<br>
> OsiClpSolverInterface::initialSolve() which is known to be feasible
and<br>
> bounded (cplex solves it to optimality). However, OsiClp reports the
linear<br>
> program to be primal infeasible. The .mps file for the linear program
and a<br>
> short code for verification can be found at,<br>
><br>
> http://www.andrew.cmu.edu/user/anureets/COIN_tmp/workspace_my.tgz
.<br>
><br>
> It would be very helpful if someone could suggest what is going wrong
and a<br>
> possible way to fix it.<br>
><br>
> regards,<br>
> Anureet Saxena<br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
> Anureet Saxena<br>
> anureet@cmu.edu<br>
> anureet@yahoo.com<br>
><br>
> --This mail was delivered to you on 100% recyclable electrons.<br>
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<br>
-- <br>
Matthew Saltzman<br>
<br>
Clemson University Math Sciences<br>
mjs AT clemson DOT edu<br>
http://www.math.clemson.edu/~mjs_______________________________________________<br>
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