Yuriy Zinchenko

Hello Huang,   can you please paste a snippet of your code, maybe even the one that does not quite work, with variable definitions etc., so that this becomes more concrete?   Thanks,

Hello Ziyad,   please do not open another post, while you already have the issue discussed. The issue is not with Gurobi, but with your model.  What are you trying to obtain in this comparison,   y...

You should examine the constraints closely, the conflict should be there. Another thing you can do to convince yourself there is an issue with the set of constraints is try to solve the model saved...

Hello Can:   presently it is not possible to have an explicit control on spatial branching, however, you can try to encourage branching on your integers by elevating the "good old" BranchPriority p...

Hello Ziyad: it is quite possible that Gurobi has determined the faulty model status in the presolve -- I presume this is what you have meant by saying "without solve", correct? For a short explana...

You can resolve this by adding auxiliary variables, for instance, if you want x * y * z term in your objective, introduce auxiliary u variable and set u == x*y through a constraint, then you can us...

These settings --changing Method-- will only affect the root relaxation, which may or may not matter (typically this is negligible for most MIPs).  However, you can experiment with that, chaining t...

Hello Ibtissam, with regards to the warning message you get, often the users improve upon this by re-scaling the units of measurement. For instance, if the RHS measures a large shipment weight, per...

Most likely the difference is due to poor model's numerics; in turn, this often leads to unstable solver's behaviour on such models.   Can you give some model stats here to begin with, namely, what...

Hello Janis, currently (v9.0) we have no automated mechanism that enables the multi-variate PW linear objectives.  One option is to build one yourself using, say, triangulation of the 3D surface co...