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The converted lp (used glpk to convert) contains no bounds
information, the bounds section which appears in the lp I've sent
I've put manually, that's why I thought that could be a bounds
problem in AMPL...<br>
<br>
<br>
<div class="moz-cite-prefix">On 30-09-2015 13:23, ovovis wrote:<br>
</div>
<blockquote
cite="mid:C3889471-23FE-4D55-A658-EE6E72BB780A@ovovis.de"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
Wait, I am confused: You just generated the LP file out of the MPS
file. If the LP file contains the proper bounds, then the MPS file
does as well. But then AMPL properly generated the mps file. So no
error on the AMPL side.
<div class=""><br class="">
</div>
<div class="">I am not an expert, but from this observation I
would derive that cbc does read lp files properly, but not mps
files.</div>
<div class=""><br class="">
</div>
<div class="">Or am I mistaken here ?</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
<div>
<blockquote type="cite" class="">
<div class="">On Sep 30, 2015, at 6:07 PM, Haroldo Gambini
Santos <<a moz-do-not-send="true"
href="mailto:haroldo.santos@gmail.com" class="">haroldo.santos@gmail.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type" class="">
<div text="#000000" bgcolor="#FFFFFF" class=""> Hi Thomas,<br
class="">
<br class="">
I generated a LP (attached) where columns apparently
related to ym variables (if I understand the .col files
correctly) appear also in the BOUNDS section of the LP
as being positive.<br class="">
<br class="">
It generated a different solution, apparently without
negative values for ym variables.<br class="">
<br class="">
Maybe the AMPL translated model is not properly getting
the bounds. What if you explicitly include<br class="">
<br class="">
ym* >= 0<br class="">
<br class="">
constraints into your AMPL model and test the results ?<br
class="">
<br class="">
Cheers<br class="">
<br class="">
<div class="moz-cite-prefix">On 30-09-2015 11:49, ovovis
wrote:<br class="">
</div>
<blockquote
cite="mid:16C5974F-8B5D-4285-8570-9E1A9E2624CC@ovovis.de"
type="cite" class="">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252" class="">
I generated the MPS file out of AMPL. If I understand
this process correctly then the variables will be
abbreviated and the .col and .row files, that I sent
you as well, are meant to translate the mps variables
into the original names. Then you should have already
all information necessary to reproduce the original
names.
<div class=""><br class="">
</div>
<div class="">But maybe I misunderstood your question.</div>
<div class=""><br class="">
</div>
<div class="">Please let me know.</div>
<div class=""><br class="">
</div>
<div class="">Thomas</div>
<div class=""><br class="">
<div class="">
<blockquote type="cite" class="">
<div class="">On Sep 30, 2015, at 4:12 PM,
Haroldo Gambini Santos <<a
moz-do-not-send="true"
href="mailto:haroldo.santos@gmail.com"
class=""><a class="moz-txt-link-abbreviated" href="mailto:haroldo.santos@gmail.com">haroldo.santos@gmail.com</a></a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta content="text/html;
charset=windows-1252"
http-equiv="Content-Type" class="">
<div text="#000000" bgcolor="#FFFFFF" class="">
Hi Thomas,<br class="">
<br class="">
I converted your MPS to LP to take a look
(don't have AMPL here). <br class="">
Strangely no "bounds" section is generated.
<br class="">
<br class="">
The MPS conversion also lost the original
names, can yon generate including the
original names so that the specific result
for variable ym is visible ?<br class="">
<br class="">
Cheers<br class="">
<br class="">
<div class="moz-cite-prefix">On 30-09-2015
10:17, ovovis wrote:<br class="">
</div>
<blockquote
cite="mid:EBCDFC4B-B3D8-478C-9076-76A1B7304404@ovovis.de"
type="cite" class="">
<meta http-equiv="Content-Type"
content="text/html;
charset=windows-1252" class="">
Hi Haraldo,
<div class=""><br class="">
</div>
<div class="">have you had a chance to
look at the lp yet ?</div>
<div class=""><br class="">
</div>
<div class="">Would be great to hear from
you. Let me know if I can be of any
further help.</div>
<div class=""><br class="">
</div>
<div class="">Thomas</div>
<div class=""><br class="">
<div class="">
<blockquote type="cite" class="">
<div class="">On Sep 28, 2015, at
3:44 PM, Haroldo Gambini Santos
<<a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:haroldo.santos@gmail.com">haroldo.santos@gmail.com</a>>
wrote:</div>
<br
class="Apple-interchange-newline">
<div class="">
<meta content="text/html;
charset=windows-1252"
http-equiv="Content-Type"
class="">
<div text="#000000"
bgcolor="#FFFFFF" class=""> Hi
Thomas,<br class="">
<br class="">
Can you send the LP where the
problem occurs ?<br class="">
<br class="">
Cheers<br class="">
<br class="">
<div class="moz-cite-prefix">On
28-09-2015 01:37, ovovis
wrote:<br class="">
</div>
<blockquote
cite="mid:E0006923-BE80-4EE7-8A57-DAA06155FE87@ovovis.de"
type="cite" class="">
<meta
http-equiv="Content-Type"
content="text/html;
charset=windows-1252"
class="">
Dear cbc team,
<div class=""><br class="">
</div>
<div class="">my name is
Thomas Enge from Berlin
Germany. We are a small (2
persons) start up company
(see also <a
moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="http://www.ovovis.de/"><a class="moz-txt-link-abbreviated" href="http://www.ovovis.de">www.ovovis.de</a></a> and then About us). We
use AMPL + cbc internally to
provide a portfolio
optimization service to
energy traders. So far we
only ran tests with our
potential customers when we
detected that cbc violates
the domain definition of
variables in the solution
for specific problem
settings. Our variables are
defined as >= 0, but the
result also produces
negative numbers for these
variables. This is the case
for version 2.9.4 - 2.9.6. </div>
<div class=""><br class="">
</div>
<div class="">My question is
how can we address this
issue best to you ? And is
there a way to receive a
quick fix or do we need to
wait for the next stable
release ? The latter is very
important for us to
understand since it effects
our go-live date.</div>
<div class=""><br class="">
</div>
<div class="">Thanks in
advance for your help</div>
<div class=""><br class="">
</div>
<div class="">Thomas Enge</div>
<br class="">
<br class="">
<div
apple-content-edited="true"
class="">
OvvvvvvvvvvvvvvvvvvvOvis<br
class="">
<br class="">
ovovis GmbH<br class="">
Dr. Thomas Enge<br class="">
Stargarder Str. 57<br
class="">
D-10437 Berlin<br class="">
<br class="">
M: +49 1515 910 5118<br
class="">
F: +49 30 538 10 188<br
class="">
E: <a moz-do-not-send="true"
href="mailto:tenge@ovovis.de" class="">tenge@ovovis.de</a><br class="">
W: <a
moz-do-not-send="true"
href="http://www.ovovis.de/"
class=""><a class="moz-txt-link-abbreviated" href="http://www.ovovis.de">www.ovovis.de</a></a><br
class="">
--------------------------------------<br class="">
Amtsgericht Charlottenburg<br
class="">
HRB 116742B<br class="">
Vat-ID: DE262642185<br
class="">
<br class="">
<br class="">
<br class="">
<br class="">
<br class="">
<br class="">
<br class="">
<br class="">
<br class="">
</div>
<br class="">
<br class="">
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<br class="">
<pre class="" wrap="">_______________________________________________
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</pre>
</blockquote>
<br class="">
<pre class="moz-signature" cols="72">--
==================================================
Haroldo Gambini Santos
D.Sc, Computer Science
Universidade Federal de Ouro Preto
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.decom.ufop.br/haroldo/">http://www.decom.ufop.br/haroldo/</a></pre>
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<br class="">
<pre class="moz-signature" cols="72">--
==================================================
Haroldo Gambini Santos
D.Sc, Computer Science
Universidade Federal de Ouro Preto
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.decom.ufop.br/haroldo/">http://www.decom.ufop.br/haroldo/</a></pre>
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</blockquote>
<br class="">
<pre class="moz-signature" cols="72">--
==================================================
Haroldo Gambini Santos
D.Sc, Computer Science
Universidade Federal de Ouro Preto
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.decom.ufop.br/haroldo/">http://www.decom.ufop.br/haroldo/</a></pre>
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<span
id="cid:28191838-7EE2-406B-96F0-92B8C2737FF4@Speedport_W_724V_Typ_A_05011603_00_007"><scheduledevrel.lp.tar.gz></span></div>
</blockquote>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
==================================================
Haroldo Gambini Santos
D.Sc, Computer Science
Universidade Federal de Ouro Preto
<a class="moz-txt-link-freetext" href="http://www.decom.ufop.br/haroldo/">http://www.decom.ufop.br/haroldo/</a></pre>
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