Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:08:53 2013

Optimize a model with 28 rows, 2046 columns and 6088 nonzeros
Presolve removed 22 rows and 24 columns
Presolve time: 0.01s
Presolved: 6 rows, 2022 columns, 4042 nonzeros
Variable types: 2022 continuous, 0 integer (0 binary)

Root relaxation: objective 4.810927e+03, 8 iterations, 0.00 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0 4810.92679    0    2          - 4810.92679     -      -    0s
     0     2 4810.92679    0    2          - 4810.92679     -      -    0s
*   39     3              20    4831.1584485 4831.12117  0.00%   1.5    0s

Explored 40 nodes (68 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.831158448459e+03, best bound 4.831121174939e+03, gap 0.0008%