[Cbc] Failure to satisfy an SOS2 constraint

[Alexis Guigue]

Hi,

This is kind of a follow-up of my previous email <<Problem writing SOS2 
constraint in the Lp file>>.
Here is the code again!

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// Create an OsiClpSolverInterface object
OsiClpSolverInterface    m_osiClpSolver;

// Populate the solver
m_osiClpSolver.loadProblem(matrix, &m_vColLower[0], &m_vColUpper[0], 
&m_vObjCoef[0], &m_vSign[0], &m_vRHS[0], 0);

// Set continuous variables
m_osiClpSolver.setContinuous(&m_vContVarIndex[0], 
(int)m_vContVarIndex.size());

// Set column and row names
m_osiClpSolver.setIntParam(OsiNameDiscipline,2);
for(int i=0;i<(int)m_vRowName.size();i++) 
m_osiClpSolver.setRowName(i,m_vRowName[i]);
for(int i=0;i<(int)m_vColName.size();i++) 
m_osiClpSolver.setColName(i,m_vColName[i]);

// Create the CbcModel object
CbcModel cbcModel(m_osiClpSolver);

// Add sos2 constraint to CbcModel
  cbcModel.addObjects(...,...);

// Optimize
cbcModel.branchAndBound();

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This was my first version. I have a function after the optimization is 
completed that checks
that my SOS2 constraints are satisfied. It passes the test when I use 
cbcModel.branchAndBound();

Now, I replace cbcModel.branchAndBound() with (standalone version)

         CbcMain0(cbcModel);
         callCbc1("-solve -quit", cbcModel);

One of my SOS2 constraint is not satisfied now. I have the impression 
that the SOS2 constraints
were not part of the optimization problem in the first place, this would 
explain why I am getting
at least not satisfied.

Is my standalone code incorrect?

Thanks in advance.

Cheers

Alexis

-- 
Software Engineer/Research Engineer
Softree Technical Systems Inc.
www.softree.com
Engineering an Easier Way