Yuriy Zinchenko

Hi Markus, have you had a chance to review the guide to numerics https://www.gurobi.com/documentation/9.0/refman/num_grb_guidelines_for_num.html for example https://www.gurobi.com/documentation/9.0...

This sounds like a non-research application; can you please submit an inquiry through our support portal at support.gurobi.com

Yes, when the model is not well-posed from a numerical stand-point, this is not unexpected.

One more note is that in Python, as you have mentioned, you can simply set MIPgap to 10%, record your time, then reset it to 5% etc., while Gurobi will actually resume the solution process from the...

Hello Manuel: The issues you are seeing with both barrier and crossover restarts are largely due to the poor numerics, think very large ranges of the coefficients, for starters, on the order of 10^...

There is no guaranteed fixed time interval at which the polling callback is called.  To give you an idea of the general frequency at which the polling callback might be called, here are some quick ...

You can simply change your variable declaration from using MVar to regular Gurobi variables; the abs-value should work there without any issues.  Have you tried that by any chance?    

I am not sure I fully follow your question here.  Are you saying that you would expect O(N^#) but instead observe O(N^2)?  This would be a good thing, would it not?  Can you please clarify what you...

Hello Soufyan: these are very general questions that can be answered by learning about the interior-point methods (or barrier algorithms) from a course, so maybe the support forum is not quite the ...

This subject is covered in details in our online doc, https://www.gurobi.com/documentation/8.1/refman/numerics_gurobi_guidelines.html   Regarding your other question > .. floating point errors? yes...