Mario Ruthmair
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Latest activity by Mario Ruthmair
Mario Ruthmair commented,
Hi Araz, The code part you are showing does not contain any Gurobi elements, Gurobi seems to be called in one of the functions that are called from here (initiate). The Gurobi error 10001 is raised...

Mario Ruthmair commented,
Since I do not know the exact definition of your optimization problem and the corresponding model formulation, it is hard to say where there is an issue. If you could give a textual and mathematica...

Mario Ruthmair commented,
Hi Jordi, In the flow conservation constraints (last set of constraints above), you do not consider the arcs from and to the depot. You need to include them here. If this results in infeasible solu...

Mario Ruthmair commented,
Hi, The Gurobi C++ interface can be used with the precompiled libraries gurobi_c++*2017.lib with Visual Studio 2017 but in some cases (and usually with different IDEs), we recommend compiling the C...

Mario Ruthmair commented,
Hi Jordi, I could not resist diving deeper into your case (I am VRPaddicted). After relating your IIS with your model formulation, I found no flaw in your code and model.The only explanation I hav...

Mario Ruthmair commented,
Hi Jordi, First, I would recommend to assign names to your variables via x = mdl.addVars( ..., name="x")u = mdl.addVars( ..., name="u") Usually, this helps a lot for debugging. Michel already argue...

Mario Ruthmair commented,
Hi Sajjad, I am not sure if I understand your request correctly. If you only relax the general integer variables and keep the binary variables, you indeed obtain a relaxation. However, it cannot be...

Mario Ruthmair commented,
Yes, exactly. If the variable names are the same, you can use MIP starts to hand over an initial solution.

Mario Ruthmair commented,
Hi, I am unsure if I understand your case, but let me try to rephrase it: The solutions returned by the solver are not optimal. You can generate solutions that further improve the objective value. ...

Mario Ruthmair commented,
Handing over multiple infeasible (or partial) solutions to the solver via MIP starts is possible. The solver then tries to repair (or complete) the solutions, but there is no guarantee that this wo...