[Coin-bcpdiscuss] Generic Branch and Cut code

[Gualtiero Tramezzi]

Thanks for the suggestion, I tried but it doesn't change nothing. :-(
The execution on SHELL example gives good results. Maybe I must start with 
SHELL and not with BAC.
BAC and SHELL comes from the same "family". In these days  I have read all 
the documentation that I found (especially about MaxCut and BAC). It seems 
that all BCP programs shares the same "skeleton" (ex: MaxCut, BAC, SHELL).I 
looked into the code but I don't understand how to specialize one program to 
do a specific task.
For example: What are the differences between BAC and SHELL?
As I said before I'm a newbie and not a code wizard. So if some one could 
give me a good hint about where to look ... it would be very kind.

Thanks,
Gualtiero.

>From: Soumitra Pal <mitra at cse.iitb.ac.in>
>To: Gualtiero Tramezzi <gtramezzi at hotmail.com>
>Subject: Re: [Coin-bcpdiscuss] Generic Branch and Cut code
>Date: Thu, 04 Jan 2007 18:09:35 +0530
>
>Hi Gualtiero,
>
>I am also new to COIN-OR. However, I think the problem is in the way you 
>write the LP file. The objective you wrote is something like
>
>y_0 w_0 + y_1 w_1 + ...
>
>and then assigned the values of w_i as constraints
>
>w0: w_0 = 10
>w1: w_1 = 5
>
>As far as I know, this is not correct way to set the objective. Why don't 
>you directly put the coefficient as follows
>
>10 y_0 + 5 y_1 + ...
>
>and remove the constraints for wi:
>
>I think with this, there should not be any problem.
>
>You can check the LP format in the doxygen generated document. The format 
>is described in the class reference document of the class CoinLpIO.
>
>Hope this helps.
>
>Soumitra,
>IIT Bombay.
>
>Gualtiero Tramezzi wrote:
>>Ok but I'm very new to COIN-OR so I can't provide much dedailed 
>>information.
>>When I feed the BAC example with a very large lp file more than 10000 
>>constraints and 20000 I obtain a segmentation fault, like this:
>>Compilation flags:
>>
>>readInput(): core size: 10 indexed size: 6
>>Segmentation fault
>>
>>This isn't probably a BCP bug, do you really want me to fill a bug with 
>>this information?
>>
>>
>>>From: Laszlo Ladanyi <ladanyi at us.ibm.com>
>>>To: Gualtiero Tramezzi <gtramezzi at hotmail.com>
>>>CC: coin-bcpdiscuss at list.coin-or.org
>>>Subject: Re: [Coin-bcpdiscuss] Generic Branch and Cut code
>>>Date: Sat, 30 Dec 2006 13:39:16 -0500 (EST)
>>>
>>>Hi Gualtiero,
>>>
>>>I'd like to track down the cause of the crash. Could you file a bug 
>>>report
>>>with as much detail as possible? Just look at
>>>https://projects.coin-or.org/Bcp/ticket/10 for the kind of info I'm 
>>>looking
>>>for.
>>>
>>>Thanks,
>>>--Laci
>>>
>>>On Sat, 30 Dec 2006, Gualtiero Tramezzi wrote:
>>>
>>> > Hello, I'm wondering if someone had wrote a generic code to solve 
>>>Integer LP
>>> > problems with BCP. I'm already working on BAC but goes on segmentation 
>>>fault
>>> > if i modify the file bac.lp.
>>> >
>>> > Thanks all of you.
>>> > Gualtiero
>>> >
>>> > _________________________________________________________________
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>>> >
>>>
>>
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