[Cbc] Cbc Digest, Vol 95, Issue 6

[Alexis]

Thanks John

I have done preliminary testing of mipStart using standalone cbc. It 
looks promising.
However, our real problems have a bunch of SOS2 constraints. I checked 
but it does not
seems that cbc v2.9.0 can import/read such files yet, am I correct? The 
other
thing I was wondering is that whether mipStart would work with SOS2 
constraints?
Say we have a lp problem with binary variables and some SOS2 
constraints, would
mipStart work by, again, just providing the values of the binary 
variables, and
leaving the variables in the SOS2 constraints to be decided?

Also, is there some doc/pub about Haroldo implementation/method?

Thanks in advance

Alexis

On 2015-05-13 10:00 AM, cbc-request at list.coin-or.org wrote:
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> Today's Topics:
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>     1. Re: Cbc Digest, Vol 95, Issue 5 (Alexis)
>     2. Re: Cbc Digest, Vol 95, Issue 5 (John Forrest)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 12 May 2015 11:09:58 -0600
> From: Alexis <aguigue at softree.com>
> To: cbc at list.coin-or.org
> Subject: Re: [Cbc] Cbc Digest, Vol 95, Issue 5
> Message-ID: <555233E6.8030501 at softree.com>
> Content-Type: text/plain; charset="windows-1252"; Format="flowed"
>
> Thanks John.
>
> I am actually using the API. I found this example
>
> https://projects.coin-or.org/Cbc/browser/trunk/Cbc/examples/hotstart.cpp
>
> I will try it. Is the example you were referring to?
>
> On 2015-05-12 10:00 AM, cbc-request at list.coin-or.org wrote:
>> Send Cbc mailing list submissions to
>> 	cbc at list.coin-or.org
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>> 	http://list.coin-or.org/mailman/listinfo/cbc
>> or, via email, send a message with subject or body 'help' to
>> 	cbc-request at list.coin-or.org
>>
>> You can reach the person managing the list at
>> 	cbc-owner at list.coin-or.org
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of Cbc digest..."
>>
>>
>> Today's Topics:
>>
>>      1. Hot Start for MIP (Alexis)
>>      2. Re: Hot Start for MIP (John Forrest)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Mon, 11 May 2015 11:07:35 -0600
>> From: Alexis <aguigue at softree.com>
>> To: cbc at list.coin-or.org
>> Subject: [Cbc] Hot Start for MIP
>> Message-ID: <5550E1D7.8030902 at softree.com>
>> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>>
>> 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
>>
>


-- 
Alexis Guigue, E.I.T., B.Eng., M.A.Sc., Ph.D.
Software Engineer/Research Engineer
aguigue at softree.com
604-519-6222, ext. 3

Softree Technical Systems Inc. <http://www.softree.com>
Engineering an Easier Way

Softree News & Updates <http://http://eepurl.com/XJT-z>
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