How to solve"Model is infeasible or unbounded Best objective -, best bound -, gap -"

[wendy444444]

Dear Johan，I read your other answers, so I try to solve it. Some constraints are modified and explicit boundaries are added, and solved the original problem. But there are still some problems unsolved. I tried to use gurobi_iis to find the formula that went wrong, but I have no clue. Please help me again. This is the result of operation.

Set parameter Username
Set parameter IntFeasTol to value 1e-06
Set parameter ScaleFlag to value 1
Set parameter BarIterLimit to value 2000000000
Set parameter CrossoverBasis to value 0
Set parameter MinRelNodes to value 0
Set parameter NodeMethod to value 1
Set parameter PumpPasses to value 0
Set parameter ZeroObjNodes to value 0
Set parameter AggFill to value 10
Set parameter PreSparsify to value 0
Set parameter TuneTrials to value 2
Academic license - for non-commercial use only - expires 2022-06-11
Gurobi Optimizer version 9.5.1 build v9.5.1rc2 (win64)
Thread count: 2 physical cores, 4 logical processors, using up to 4 threads
Optimize a model with 6940 rows, 1140 columns and 13591 nonzeros
Model fingerprint: 0x49adfbe9
Variable types: 888 continuous, 252 integer (252 binary)
Coefficient statistics:
  Matrix range     [8e-02, 3e+03]
  Objective range  [1e+00, 1e+00]
  Bounds range     [1e+00, 1e+00]
  RHS range        [1e+00, 3e+03]
Presolve time: 0.02s

Explored 0 nodes (0 simplex iterations) in 0.09 seconds (0.00 work units)
Thread count was 1 (of 4 available processors)

Solution count 0

Model is infeasible or unbounded
Best objective -, best bound -, gap -
时间已过 16.140629 秒。
Set parameter Username
Academic license - for non-commercial use only - expires 2022-06-11

IIS computed: 1 constraints, 0 bounds
IIS runtime: 0.11 seconds (0.00 work units)

[wendy444444]

[wendy444444]

Thank you for your answer. How did you determine that my program is not feasible? The result I obtained using sol = optimize(C,Objective);if sol.problem==0;display('Feasible');else;display('Infeasible');end is feasible.

[johanlofberg]

Gurobi said it was infeasible or unbounded. Hence remove the objective to check if it still complains (thus about feasibility) or not (i.e. it was unbounded)

[wendy444444]

Thank you for your wise advice, the program is running, but it took a long time, these page appears, what should I do, please?

[johanlofberg]

What do you mean with what to do. The solver is working, now you just have to wait until in completes, which might take a second/ hour/day/month/year/eons https://yalmip.github.io/slowmilp

[wendy444444]

Thank you very much. I will try to do it.