David Torres Sanchez

Hi Yifeng, If variable A does not appear in any constraints or the objective it can be removed from the problem.It's value set to 0 as they don't have an effect on the problem. This is expected and...

Hi again Yifeng, That looks good, near the bottom of the log it says that the solution count is 1000 (all are feasible solutions).All of them have objective value 0 as you don't have an objective f...

Hi Yifeng, That is interesting. The problem is relatively small, is it solved during presolve? You can see this in the log when presolve removes all rows + columns.If you can share the log and copy...

Hi, Have you tried to follow How do I find additional solutions to a model?  and links within? Cheers, David

Hi, You can find the Python versions supported here: Which Python versions are supported by Gurobi?  You can install them easily with conda (or pip).This doesn't require system environment variable...

Hi Thomas, I think it is not yet implemented.I will relay this feature request to the developers. Cheers, David

Hi Thomas, Sorry for the delay. Thanks for the extra info. Indeed as you mention in the first message callbacks are only registered for a single solve or instance (this solve uses multiple threads)...

You can try replacing the capacity constraints with an equivalent constraint. For example, you can use the \(\texttt{addVehicleLoadConstraintsByFlows}\) in the cvrp notebook: https://github.com/rut...

Hi Vanny, I think the infeasibility may be coming from the demand data and capacity constraint.If we have positive demand for any node this is always infeasible unless one of the nodes has the same...

Hi Hongmin, Apart from the documentation, you can also find more details about this in the Ed Klotz webinar: Video: https://www.youtube.com/watch?v=qGgJ0gBptwY Slides: https://www.gurobi.com/wp-c...