Simranjit Kaur

Hi Koen, First of all, great job on the steps you have already taken to speed up the solution time for your model! VRPTW are often complex problems to solve. One direction could be to play with the...

Hi Rayan, Your solution is correct. You can model this as follows: m.addConstrs( sum( h[k,j,t] for k in I if k != i) <= M *( 1- u[i,j,t] ) for i in I  for j in J for t in T ) Please choose the sm...

Hi Arthur, Thanks for providing context to the problem you are solving. I understand you want to find two binary matrices, W and H, such that X is the boolean product of W and H. For example, \( W ...

Hi Daniel, You can possibly use the binary variables start_binary[p, r] and end_binary[p, r] to model the definition of is_available[p,r] variable. Would something like the following work for you? ...

Hi Arthur, Please have a look at our knowledge base article How do I model conditional statements in Gurobi? Best regards, Simran

Hi Iason, Just to add to what Maliheh explained about the irreducible inconsistent system (IIS) in her comment: If you set bounds for a variable in the model, but it appears as free in the IIS, it ...

Hi Xinshuo, To suppress all output, you can set the OutputFlag parameter to 0 in your environment. Alternatively, you can direct the log to a file without printing it to the console by setting the ...

There is no need to add a new variable, you can simply update the lower bound of the existing variable. For instance, x.lb = 1 will set the lower bound of variable x to 1. The next model.optimize()...

You can open this file using any text editor and check the variables that have conflicting bounds.  

Hi Fei Wang, Indeed, my previous suggestion will help save time for larger values of self.r. With respect to the SOCP constraints, you can try adding them using the addGenConstrNorm method. It is s...