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Hi Alex,<br>
<br>
Right now mipStart only decides the values of auxiliary variables,
i.e. variables whose value can be deduced by the value of the main
decision variables.<br>
<br>
If I understand correctly what you are trying to do is a
fix-and-optimize heuristic: to fix the bounds of some variables and
optimize the remaining (including variables appearing in SOS
constraints).<br>
<br>
Right now there is no option to specify bounds of variables in a
separated file. Only in the problem file (e.g. LP file) there is a
bounds section, but it certainly would be interesting to have the
possibility of specifying it in another file. I'll take a look at
that.<br>
<br>
Cheers,<br>
<br>
Haroldo<br>
<br>
<div class="moz-cite-prefix">On 19-05-2015 15:56, Alexis wrote:<br>
</div>
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<div class="moz-cite-prefix">Thanks John<br>
<br>
I have done preliminary testing of mipStart using standalone
cbc. It looks promising. <br>
However, our real problems have a bunch of SOS2 constraints. I
checked but it does not<br>
seems that cbc v2.9.0 can import/read such files yet, am I
correct? The other<br>
thing I was wondering is that whether mipStart would work with
SOS2 constraints?<br>
Say we have a lp problem with binary variables and some SOS2
constraints, would<br>
mipStart work by, again, just providing the values of the binary
variables, and <br>
leaving the variables in the SOS2 constraints to be decided?<br>
<br>
Also, is there some doc/pub about Haroldo implementation/method?<br>
<br>
Thanks in advance<br>
<br>
Alexis<br>
<br>
On 2015-05-13 10:00 AM, <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:cbc-request@list.coin-or.org">cbc-request@list.coin-or.org</a>
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Date: Tue, 12 May 2015 11:09:58 -0600
From: Alexis <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:aguigue@softree.com"><aguigue@softree.com></a>
To: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a>
Subject: Re: [Cbc] Cbc Digest, Vol 95, Issue 5
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Thanks John.
I am actually using the API. I found this example
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://projects.coin-or.org/Cbc/browser/trunk/Cbc/examples/hotstart.cpp">https://projects.coin-or.org/Cbc/browser/trunk/Cbc/examples/hotstart.cpp</a>
I will try it. Is the example you were referring to?
On 2015-05-12 10:00 AM, <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:cbc-request@list.coin-or.org">cbc-request@list.coin-or.org</a> wrote:
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<pre wrap="">Send Cbc mailing list submissions to
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Today's Topics:
1. Hot Start for MIP (Alexis)
2. Re: Hot Start for MIP (John Forrest)
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Message: 1
Date: Mon, 11 May 2015 11:07:35 -0600
From: Alexis <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:aguigue@softree.com"><aguigue@softree.com></a>
To: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a>
Subject: [Cbc] Hot Start for MIP
Message-ID: <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:5550E1D7.8030902@softree.com"><5550E1D7.8030902@softree.com></a>
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I have got a large MIP to solve for which I would like to implement a
hot start strategy.
My understanding is that I should use the function
CbcModel::setHotstartSolution(const double *solution, const int
*priorities=NULL),
where solution assumes the same ''order'' of variables as defined for
the model itself. I am not so sure to understand the meaning of
the pointer priorities though. The hotstart solution I intend to give is
an actual feasible solution to the MIP.
Am I on the right track?
Thanks in advance for the help
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<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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