ce jekl

I have two "mathematically equivalent" models. The only difference between Model 1 and Model 2 is that Model 1 has 20w redundant constraints more than Model 2.Here is the log for Model 2: ```Gurobi...

I just set the Method to 1, and change variable bounds and resolve it several times. And I found in the log:```Gurobi Optimizer version 12.0.2 build v12.0.2rc0 (linux64 - "Ubuntu 22.04.4 LTS") CPU ...

I am currently developing a set of heuristics that are similar to local branching. After incorporating all the local branching constraints into my model, my approach involves only modifying the con...

Is it possible to pass the Gurobi model from c++ to python by reference or something like that, instead of writing the model to mps in c++ and reading the file in python? I have a project of which ...

I need to use gurobi feasRelaxS, and my model is built in pyomo. Is there a way to use pyomo to solve a feasRelax model?

If gurobi detects the problem is unbounded, e.g. unbounded LP, what solution will be returned? For example, \[\begin{align}\min \alpha \\ s.t. x \ge 0 \end{align} \] what is the value of \(x\)?

Is there any explanation for quadratic programming? I don't quite understand the logging of QP. What's the meaning of QLMatrix in the log? I have no coefficient less than 1, why there's a 7e-2 in ...

From the online doc, I know the sign of dual depends on the sense of constraints, but I'm confused with the following example: m.addConstr(x <= y)m.addConstr(x - y <= 0)m.addConstr(0 <= y - x)m.add...

I use model.addConstr(x.sum(i, '*') <= 1, f"constr_{i}") However, if x.select(i, '*') is empty, the constraint cannot be get by name. m = Model()c = m.addConstr(0 <= 1, "123")m.update()assert c is ...

I know gurobi have a getA() method to get constraint matrix. But how to get the rhs of all constraints and the objective coefficient vector?