Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:46:19 2013 Optimize a model with 56 rows, 570 columns and 4110 nonzeros Presolve removed 22 rows and 136 columns Presolve time: 0.01s Presolved: 34 rows, 434 columns, 3666 nonzeros Variable types: 420 continuous, 14 integer (14 binary) Root relaxation: objective 3.881594e+03, 15 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3881.59364 0 4 - 3881.59364 - - 0s H 0 0 3893.8994555 3881.59364 0.32% - 0s 0 0 3881.86365 0 4 3893.89946 3881.86365 0.31% - 0s 0 0 3883.77875 0 4 3893.89946 3883.77875 0.26% - 0s 0 0 3883.84810 0 4 3893.89946 3883.84810 0.26% - 0s 0 0 3883.87749 0 4 3893.89946 3883.87749 0.26% - 0s 0 0 3883.87956 0 4 3893.89946 3883.87956 0.26% - 0s 0 0 3893.87076 0 2 3893.89946 3893.87076 0.00% - 0s Cutting planes: Implied bound: 2 Flow cover: 2 Explored 0 nodes (67 simplex iterations) in 0.03 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.893899455474e+03, best bound 3.893870759406e+03, gap 0.0007%