Elisabeth Rodríguez Heck

Hi Gianmarco,  The "infeasible" in the third column of the log means that the corresponding node was pruned by infeasibility (the constraints imposed by the branching path of that node together wit...

Hi, You can provide an initial solution to Gurobi using a MIP Start. Please see How do I use MIP starts? for more information. However, please note that it is possible that your MIP start might not...

Hi,  The screenshots you posted correspond to an Academic Named-User License. This type of license does not have the fields WLSACCESSID and WLSSECRET that are needed to run Gurobi on Colab with WLS...

Hi, Let's take variable \(\texttt{dist12}\) as an example. You can modify its lower bound either in the definition, by doing dist12 = model.addVar(vtype=gp.GRB.CONTINUOUS, lb=-gp.GRB.INFINITY) or l...

Hi, This is expected behavior, the zero lower bounds of the variables are not printed because they are default. Best regards, Elisabeth

Hi, The Model() and quicksum() methods are part of the gurobipy package. Since you imported gurobipy as gp, you have to call these models using the gp prefix, for example, instead of writing md1=Mo...

Hi Igor, Which Gurobi version are you using? In version 9.5 the MemLimit parameter had to be set before starting the environment. If you are using 9.5, your code should be replaced by GRBEnv env = ...

Hi Elisabeth, If the number of decision variables changes then it is not only a constant that has to be changed, since this means that there will be some variables that are present in some of the s...

Hi Elisabeth, It is hard to answer this question in general without having more specific information. What exactly do you mean by subproblems: subproblems in the sense of Column Generation or Bende...

Hi Sophie, This is a huge model!  Some comments on your current parameter settings: The combination of Presolve=2 PreSparsify=1 looks like a very good choice because presolve is able to greatly re...