[Coin-lpsolver] Re: [Coin-bcpdiscuss] BAP question

[Matthew Galati]

Peter,

It seems to be crashing because, after finding an LP to be infeasible 
(in BCP_lp_fathom), it is asking CLP for a dual ray and sending this to 
BCP_restore_feasibility - but CLP returns NULL for the dual ray.

Is anyone using BCP plus a recent version of CLP to do pricing?

Matt



> Hi Peter,
>
> I am sorry that the discussion list is not as active as you might 
> hope. In the future, if your question is not answered by bcpdiscuss, 
> you should try the general coin discussion list. There are only a few 
> people on this list, but many on coin-discuss.
>
> I was able to repeat the error. It looks like the dual vector (pi) is 
> NULL at the point where it crashes. Last time I tried this (over one 
> year ago), it was working fine. So, something must have changed in BCP 
> or CLP. When I have some time, I will debug it and get back to you.
>
> Thanks,
> Matt
>
>
>
> ------------------------------
> ------------------------------
>
> Yes the example is right one from the link. And I am using Linux,
> By looking at the par.par file, it is using AAP_datafile  
> ../Data/small/6.1.aap.
> The reason I didn't put the question to the discussion list, no one 
> answers my previous questions.
>  
> Thanks,
>  
> Peter.
>
>> Sending this again.... this time I removed the long LOG file.
>>
>> Matt
>>
>>> Hi Heesu,
>>>
>>> I am forwarding your question to COIN's BCP discussion list. I have 
>>> not used BCP in a long time - and some things may have changed.
>>>
>>> Can you tell us more about what type of environment you are running 
>>> in (Linux? Unix?), etc. Also, which example instance did you try?  
>>> Is this the AAP_BP example from 
>>> http://sagan.ie.lehigh.edu/coin/COIN_EXAMPLES/AAP_BP/Doc/aap/index.html 
>>> ?
>>>
>>> I will try to repeat it when I have some free time. Has anyone else 
>>> used AAP_BP? Had any trouble?
>>>
>>> Matt
>>>
>>>-- 
>>>Matthew Galati - Optimization Developer
>>>SAS Institute - Analytical Solutions
>>>Phone 919-531-0332, R5327 
>>>Fax   919-677-4444
>>>http://coral.ie.lehigh.edu/~magh
>>>http://ordlnx2.na.sas.com/projects/OptWiki
>>>http://www.sas.com/technologies/analytics/optimization/
>>>
>>>
>>>
>>> -------- Original Message --------
>>> Subject: 	BAP question
>>> Date: 	Fri, 15 Apr 2005 15:38:39 -0500
>>> From: 	Heesu Hwang <hxh9528 at exchange.uta.edu>
>>> To: 	<magh at lehigh.edu>
>>>
>>>
>>>
>>>Dear, M.V. Galati.
>>>
>>>My name is Heesu Hwang, and I am a Ph.D student in IMSE of University of
>>>Texas at Arlington, Texas, USA.
>>>My current research is about generating columns using COIN/BCP.
>>>I came across your example and have tried to run it after compilation.
>>>It has given some results, however didn't show them all, terminating with
>>>
>>>"Segmentation fault" message.
>>>
>>>I am not good a Unix, but usually I've got that kind of messages when I
>>>used pointers improperly or too much memory spaces.
>>>
>>>Attached is the result.
>>>Could you give me some comments on it?
>>>
>>>Sincerely,
>>>
>>>Heesu Hwang.
>>>  
>>>
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>>
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