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

[John J Forrest]

The OsiClp unit test was slightly broken and so was skipping dual ray 
test.  Error shows up and I should have it fixed soon.

John Forrest



Matthew Galati <magh at lehigh.edu> 
Sent by: coin-lpsolver-bounces at list.coin-or.org
04/18/2005 11:47 PM

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






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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