[Cbc] I think we found a bug in cbc: How can we report it and get fixed quickly ?

[ovovis]

If you look at the AMPL file you will see that I did exactly that:

var ym{h in 1..H} >= 0;

I even added an extra constraint. But it did not help.

Does that rather mean that something is wrong with the AMPL Solver Library (ASL) ?
> On Sep 30, 2015, at 6:07 PM, Haroldo Gambini Santos <haroldo.santos at gmail.com> wrote:
> 
> Hi Thomas,
> 
> 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.
> 
> It generated a different solution, apparently without negative values for ym variables.
> 
> Maybe the AMPL translated model is not properly getting the bounds. What if you explicitly include
> 
>  ym*   >= 0
> 
> constraints into your AMPL model and test the results ?
> 
> Cheers
> 
> On 30-09-2015 11:49, ovovis wrote:
>> 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.
>> 
>> But maybe I misunderstood your question.
>> 
>> Please let me know.
>> 
>> Thomas
>> 
>>> On Sep 30, 2015, at 4:12 PM, Haroldo Gambini Santos <haroldo.santos at gmail.com <mailto:haroldo.santos at gmail.com>> wrote:
>>> 
>>> Hi Thomas,
>>> 
>>> I converted your MPS to LP to take a look (don't have AMPL here). 
>>> Strangely no "bounds" section is generated. 
>>> 
>>> 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 ?
>>> 
>>> Cheers
>>> 
>>> On 30-09-2015 10:17, ovovis wrote:
>>>> Hi Haraldo,
>>>> 
>>>> have you had a chance to look at the lp yet ?
>>>> 
>>>> Would be great to hear from you. Let me know if I can be of any further help.
>>>> 
>>>> Thomas
>>>> 
>>>>> On Sep 28, 2015, at 3:44 PM, Haroldo Gambini Santos < <mailto:haroldo.santos at gmail.com>haroldo.santos at gmail.com <mailto:haroldo.santos at gmail.com>> wrote:
>>>>> 
>>>>> Hi Thomas,
>>>>> 
>>>>> Can you send the LP where the problem occurs ?
>>>>> 
>>>>> Cheers
>>>>> 
>>>>> On 28-09-2015 01:37, ovovis wrote:
>>>>>> Dear cbc team,
>>>>>> 
>>>>>> my name is Thomas Enge from Berlin Germany. We are a small (2 persons) start up company (see also  <http://www.ovovis.de/>www.ovovis.de <http://www.ovovis.de/> 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. 
>>>>>> 
>>>>>> 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.
>>>>>> 
>>>>>> Thanks in advance for your help
>>>>>> 
>>>>>> Thomas Enge
>>>>>> 
>>>>>> 
>>>>>> OvvvvvvvvvvvvvvvvvvvOvis
>>>>>> 
>>>>>> ovovis GmbH
>>>>>> Dr. Thomas Enge
>>>>>> Stargarder Str. 57
>>>>>> D-10437 Berlin
>>>>>> 
>>>>>> M: +49 1515 910 5118
>>>>>> F: +49 30 538 10 188
>>>>>> E: tenge at ovovis.de <mailto:tenge at ovovis.de>
>>>>>> W: www.ovovis.de <http://www.ovovis.de/>
>>>>>> --------------------------------------
>>>>>> Amtsgericht Charlottenburg
>>>>>> HRB 116742B
>>>>>> Vat-ID: DE262642185
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
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>>>>> 
>>>>> -- 
>>>>> ==================================================
>>>>> Haroldo Gambini Santos
>>>>> D.Sc, Computer Science
>>>>> Universidade Federal de Ouro Preto
>>>>> http://www.decom.ufop.br/haroldo/ <http://www.decom.ufop.br/haroldo/>
>>> 
>>> -- 
>>> ==================================================
>>> Haroldo Gambini Santos
>>> D.Sc, Computer Science
>>> Universidade Federal de Ouro Preto
>>> http://www.decom.ufop.br/haroldo/ <http://www.decom.ufop.br/haroldo/>
> 
> -- 
> ==================================================
> Haroldo Gambini Santos
> D.Sc, Computer Science
> Universidade Federal de Ouro Preto
> http://www.decom.ufop.br/haroldo/ <http://www.decom.ufop.br/haroldo/><scheduledevrel.lp.tar.gz>

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