Maliheh Aramon

Hi Fikri,  How do I try different seeds? There is a parameter named Seed in Gurobi that you can use like any other parameter. The default value is 0.  You are very welcome! Best regards, Maliheh  

Hi Fikri,  Thank you for the detailed message and sharing all the experiments.  I have completed the experiments that you suggested, except the one which requires me to increase the number of dens...

Hi Benay,    To debug your code and narrow down the infeasibility in your model, you can use the Gurobi Model.computeIIS() method to find an irreducible inconsistent subsystem (IIS) and write it in...

Hi John,  Using your code snippet, let us define the total travel time for each truck as below: total_travel_time_per_truck = {}for h, _ in group.items(): total_travel_time_per_truck[h] = gp.Li...

Hi Arash,  You can define two lists \(I\) and \(J\) being the list of \(i\) indices and their corresponding \(j\) indices. In your example, we would have \(I= [1, 2]\) and \(J = [2, 4]\), You can t...

Hi Benay,    The real issue is that the constraint below does not guarantee that the consecutive visits to node \(i\) are at least 20 days apart. The constraint below just ensures that if node \(i\...

Hi Arash,    It would probably make more sense to write a function that gets a column as an input and solves the optimization problem using the Gurobi Optimizer. For example, if you are using Gurob...

Hi John,  Let me recap what I understood from your question. There are binary decision variables \(x_{jt}\) being equal to 1 if truck \(t\) traverses the edge \(j\) and 0, otherwise.  For each tr...

Hi Zeyang, Would you like to explain it, "Note that the set Sj should include all days before and after day j.... "? Why do I need to consider both parts, before and after the time point, xeij, th...

Hi Victor,   As discussed in the documentation of the Threads parameter, increasing the number of threads does not necessarily result in faster runtime on all models.  Furthermore, if you are shari...