presolved in MILP

Hao Chen Source

Presolve: All rows and columns removed Iteration Objective Primal Inf. Dual Inf. Time 0 9.9086144e-01 0.000000e+00 0.000000e+00 0s 16 9.9086144e-01 0.000000e+00 0.000000e+00 0s

Solved in 16 iterations and 0.00 seconds Optimal objective 9.908614362e-01 Gurobi 5.5.0: optimal solution; objective 0.9908614362 16 simplex iterations

whats the problem and I cannt find it for two weeks. I can test the model right under small network data file. But when I test under larger network with more nodes, it occurs this kind of problems shown above.

amplgurobi

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