[Coin-discuss] Cbc question: Adding SOS data to a preprocessed problem

[Kish Shen]

Hi,

I am trying to add SOS data to a problem to my code. Currently, my code use 
OsiClpSolverInterface to setup a problem. To solve a MIP problem, I create a
preprocessed copy of the problem:

	mipsolver = process.preProcess(*lpd->lp->Solver, false, 5);

where lpd->lp->Solver is the `original' problem, and is OsiClpSolverInterface*,
mipsolver is a OsiSolverInterface*.

The CbcModel for the problem is then created by:

mipmodel = new CbcModel(static_cast<OsiSolverInterface &>(*mipsolver));

Looking at the example Cbc code sample4, SOS data can be added to a CbcModel
using 

mipmodel->addObjects(nsos,objects);

where objects is an array of CbcObjects constructed using CbcSOS.

However, the construction of the CbcObjects are done using the column indexes from 
the original problem, not the preprocessed problem that was assigned to mipmodel. So
I assume I cannot simply call addObjects as above. Is there anyway I can add these SOS
to the problem? 

Thanks in advance for any information/help!

Cheers,

Kish