[Coin-discuss] arithmetic exception when using Cbc

[John J Forrest]

Kish,

Yes - send me the file.

Thanks

John



Kish Shen <kish.shen at crosscoreop.com> 
Sent by: coin-discuss-bounces at list.coin-or.org
11/02/2006 11:28 AM
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[Coin-discuss] arithmetic exception when using Cbc






Hi,

I am getting an arithmetic exception when using Cbc/Clp through OsiClp. 
The crash happens in
CbcModel.cpp, in gcd (line 84 in the copy I am using):

  while (remainder) {
    remainder = b % a;
    b = a;
    a = remainder;
  }
  return b;

The crash happens  in doing the % operation, I assume because a = -1.

This is within a call to a call to CbcModel's branchAndBound().

I am using Cbc/Clp as an MP solver for the Constraint Logic Programming 
Language ECLiPSe,
for which I am providing an interface. The original problem occurs in a 
program of one of our
users, and it happens after repeated solving and modification of the 
problem.

I have extracted the C/C++ calls to Osi/Cbc that reproduce this problem 
without ECLiPSe. The
file is quite big, nearly 300K in size, so I am not including it with this 
message.

I get this error with a copy of the development branch of Cbc I donwloaded 
on 2006-08-17. I have
just tried to run the same code with the latest development branch which I 
downloaded 
today (2006-11-02), but the program aborts much earlier. I haven't been 
able to look at why this
happens yet.

Does this problem look like it might be something that I am doing wrong, 
or something that
might have been fixed since August? 

I guess John Forrest might be interested in looking at the code that give 
this problem. Do
please let me know, and I can send the code to you.

Thanks in advance for any information and help!

Kish Shen


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