[Osi] Question about function getRowPrice()

[danh hua]

Hi all,

I tried to use function getRowPrice() to get the solution of dual solution
from an IP problem. But I received the result contain all zero value. I
don't know the reason why. Can anyone give me an suggestion?


my IP problem is:

*NAME EXAMPLE
ROWS
 N OBJ
 L ROW1
 L ROW2
 L ROW3
COLUMNS
 INT1 'MARKER' 'INTORG'
 COL1 OBJ 20
 COL1 ROW1 1  ROW3 1
 COL2 OBJ 20
 COL2 ROW1 1  ROW2 1
 COL3 OBJ 20
 COL3 ROW2 1  ROW3 1
 COL4 OBJ 5
 COL4 ROW3 1
 COL5 OBJ 5
 COL5 ROW1 1
 COL6 OBJ 5
 COL6 ROW2 1
 INT1END 'MARKER' 'INTEND'
RHS
 RHS ROW1 1
 RHS ROW2 1
 RHS ROW3 1
ENDATA*

and my code is:

...

*model.setObjSense(-1);
model.branchAndBound();
//..................get dual solution................*

*OsiSolverInterface * solver;*

*if** (preProcess) {*

*process.postProcess(*model.solver());*

*// Solution now back in solver1*

*solver = & solver1;*

*} **else** {*

*solver = model.solver();*

*}*

*const double *dualSolution= solver->getRowPrice();
int numberRows=model.getNumRows();
int iRows;*

*for(iRows=0;iRows<numberRows;iRows++){
    double value=dualSolution[iRows];
    std::cout<<value<<std::endl;
  }*

the result I got is (0,0,0).

Thanks,

Danh Hua
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