[Coin-discuss] CglRedSplit abort while resolving modified problem

[Kish Shen]

Hi,

I tried playing around with some of the cut generators, and when I added the 
RedSplit cut generator, I got the following abort:

### ERROR: CglRedSplit::generateCuts(): cstat[0]: 0

while resolving a simple MIP problem -- the initial problem was solved, and 
then modified, and resolved. The above abort happened during the resolve.

the way I solve a MIP problem is to create the problem in a 
OsiClpSolverInterface, then copy this problem to a CbcModel after 
preprocessing it (with CglPreprocess), add the cut generators, etc. (as done 
in sample2.cpp example). After the branch and bound, the problem is post 
processed back into the OsiClpSolverInterface.

After extracting the solution state from the post processed problem in 
OsiClpSolverInterface, the problem is then modified and a new CbcModel 
created for the modified problem, which is again preprocessed and put into 
the CbcModel. The abort occurs during the branch and bound on this modified 
problem.

I have generated a program with calls to the COIN libraries that reproduce 
this problem. John (I assume), please let me know if you would like me to 
send the program to you.

Thanks and cheers,

Kish