[Osi] OsiClp gives wrong iteration count?

[Goossens Jan-Willem]

Hi,

Either it's me, or the iteration count reported through OsiClpSolverInterface is wrong.

The following code solves a small problem:

        OsiClpSolverInterface model;

        int start[] = { 0, 1, 2};
        int index[] = { 0, 0};
        double values[] = {1.0, 2.0};
        double collb[] = {0.0, 0.0};
        double colub[] = {10.0, 10.0};
        double obj[] = { 1.0, 1.0};
        double rowlb[] = { 0.0};
        double rowub[]= { 3.9};

        // obj: Max x0 + x1
        //  st. x0 + 2 x1 <= 3.9
        //              0 <= x0 <= 10 and integer
        //              0 <= x1 <= 10
        model.loadProblem(2, 1, start, index, values, collb, colub, obj, rowlb, rowub);
        model.setObjSense(-1.0);
        model.initialSolve();

        std::cout << "algorithm:" << model.lastAlgorithm() << std::endl;
        std::cout << "iteration count:" << model.getIterationCount() << std::endl;


The output is

Coin0506I Presolve 1 (0) rows, 2 (0) columns and 2 (0) elements
Clp0006I 0  Obj -0 Dual inf 2 (2)
Clp0006I 1  Obj 3.9
Clp0000I Optimal - objective value 3.9
Clp0032I Optimal objective 3.9 - 1 iterations time 0.012
algorithm:2
iteration count:0

So, Clp says "1 iterations", but the OsiClpSolverInterface says 0.

Is this a bug or a feature?

I'm working with the source as they come with Cbc-2.3.0..
Thanks in advance,

Jan-Willem Goossens