[Coin-lpsolver] Assertion failed in ClpSimplex

[John J Forrest]

I took out assert a few days ago.



"E Bouillet" <ebouillet at hotmail.com> 
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08/19/2005 05:51 PM

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[Coin-lpsolver] Assertion failed in ClpSimplex







I am using Osi/Cbc/Clp in order to solve a weighted bin packing problem. I 

use addColumn/addRow to generate the problem, do a writeMps to make sure 
that it's correct, and solve it using branchAndBound - I am not an OR 
expert, and I am not sure that I am using the OSI interface properly - but 

that works for small problems.

However when I try a larger problem, it runs for a while, and I can see 
that 
it converges to an optimal solution, until it fails an assertion 
(fabs(theta_)>1.0e-13) in ClpSimplex.cpp. Ignoring that assertion fail 
doesn't seem to bother Clp, but I am wondering what is the impact of that 
on 
the solution and if this happens because I built the problem improperly. I 

couldn't find anything in the recent coin-lpsolver archives about that and 

would greatly appreciate any help.

The package is compiled for windows XP using VC++.

thanks!
eric,


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