Ronald van der Velden

So why Gurobi reject this as a initial solution? This you can learn by fixing the solution (set the lowerbound and upperbound of each variable equal to the start solution) and asking Gurobi to op...

Hi, this problem might occur if there are constraints around the boundary between the two years (e.g. if you have 3 shifts in a workforce puzzle on Dec 29-31 and 3 shifts on Jan 1-3, but maximum fi...

Hi, You could use the ResultFile parameter to specify where Gurobi should store a logfile while solving your model. It would also contain information about the method used to solve your model (e.g....

Ah, the fact that there's a variable on the left side does not allow a quick fix. Still, you could try multiplying both sides by \[max_{j,l,k}^{box}\] to see if this improves performance. I'm assum...

Hi Eugene, You could do something like this: import gurobipy as gpfrom gurobipy import GRBH = range(3)K = [7, 13, 16]with gp.Env() as env, gp.Model(env=env) as model:    V = model.addVars(H, name='...

Hi Jaime, Instead of using Pool.map, you could look at a slightly lower-level approach where you start N processes and keep them running continuously (maintaining their own Gurobi environment objec...

Hi Lennard, My first reaction would be that you could separate (x * l)/y from y/y=1. Then the question is where this expression would be used - in a constraint or the objective function? For a cons...

Hi Jiakang, There are several options for this. You could use the model.copy() function. This gives you a complete, independent copy of the model. It also means any references to variables/constra...

The full puzzle is still not entirely clear now. Is the challenge now to partition the rows into four groups, where each row gets a +/- sign, and the product/sum within each group must match a cert...

The approach is roughly what I had in mind. The best way to verify if it's 100% correct, would be by testing it on several datasets. Kind regards,Ronald