current bounds on the number of colors: 0 -- 28 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:22 2012 Optimize a model with 2618 rows, 577 columns and 8162 nonzeros Presolve time: 0.01s Presolved: 2618 rows, 577 columns, 8162 nonzeros Variable types: 0 continuous, 577 integer (577 binary) Root relaxation: objective 0.000000e+00, 67 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (211 simplex iterations) in 0.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 14 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:22 2012 Optimize a model with 1323 rows, 381 columns and 4081 nonzeros Presolve time: 0.00s Presolved: 1323 rows, 381 columns, 4081 nonzeros Variable types: 0 continuous, 381 integer (381 binary) Root relaxation: objective 0.000000e+00, 56 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 18 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (390 simplex iterations) in 0.01 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:22 2012 Optimize a model with 583 rows, 269 columns and 1749 nonzeros Presolve time: 0.00s Presolved: 583 rows, 269 columns, 1749 nonzeros Variable types: 0 continuous, 269 integer (269 binary) Root relaxation: objective 0.000000e+00, 59 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 54 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 1 Clique: 98 Zero half: 92 Explored 0 nodes (250 simplex iterations) in 0.01 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - current bounds on the number of colors: 3 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:22 2012 Optimize a model with 953 rows, 325 columns and 2915 nonzeros Presolve time: 0.00s Presolved: 953 rows, 325 columns, 2915 nonzeros Variable types: 0 continuous, 325 integer (325 binary) Root relaxation: objective 0.000000e+00, 57 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 40 - 0.00000 - - 0s 0 0 0.00000 0 30 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (842 simplex iterations) in 0.04 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - current bounds on the number of colors: 5 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:22 2012 Optimize a model with 1138 rows, 353 columns and 3498 nonzeros Presolve time: 0.00s Presolved: 1138 rows, 353 columns, 3498 nonzeros Variable types: 0 continuous, 353 integer (353 binary) Root relaxation: objective 0.000000e+00, 60 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 32 - 0.00000 - - 0s 0 0 0.00000 0 36 - 0.00000 - - 0s 0 0 0.00000 0 20 - 0.00000 - - 0s 0 0 0.00000 0 96 - 0.00000 - - 0s 0 0 0.00000 0 91 - 0.00000 - - 0s 0 0 0.00000 0 18 - 0.00000 - - 0s 0 0 0.00000 0 89 - 0.00000 - - 0s 0 0 0.00000 0 86 - 0.00000 - - 0s 0 0 0.00000 0 75 - 0.00000 - - 0s 0 0 0.00000 0 65 - 0.00000 - - 0s 0 0 0.00000 0 38 - 0.00000 - - 0s 0 0 0.00000 0 61 - 0.00000 - - 0s 0 0 0.00000 0 61 - 0.00000 - - 0s 0 2 0.00000 0 61 - 0.00000 - - 0s Cutting planes: Clique: 4 Zero half: 13 Explored 11 nodes (7815 simplex iterations) in 0.52 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 7