[Cbc] [CBC] Problem with function getRowPrice()

[danh hua]

Hi all,
I read from the Cbc documentation (
http://www.coin-or.org/Cbc/ch02s04.html ) that
the function getRowPrice()
is to get the solution of the dual problem. But it did not work in my
problem correctly.
Does anyone has a suggestion?

my integer 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................*

*const double *dualSolution=model.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
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