Vincent
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Latest activity by Vincent
Vincent commented,
Thanks very much for your quick and detailed response.

Vincent created a post,
Merging a binary decision variable with a continuous variable (semibinary/continuous)
AnsweredI have two decision variables defined as x = m.addVars(((i, j) for i, j in arcs if f[i][j] == 0),vtype=GRB.BINARY, name='x')y = m.addVars(((i, j) for i, j in arcs if f[i][j] == 1),vtype=GRB.CONTINU...

Vincent commented,
Hi Matthias, Thanks for your help. Is the itertools.product method faster than the first one? Thanks,Vincent

Vincent created a post,
How to use addVars() in GurobiPy using "if" conditional?
AnsweredI have defined a variable using addVar() method as follows: for i in range(no_nodes): for j in range(no_nodes): for k in O: if fij[i][j]==1 or mij[i][j]==1: x[i,j,k] = m.addVar(vtyp...

Vincent commented,
That was actually the issue! Thank you Danial Ramin.

Vincent commented,
Hi,I am setting the LogFile parameter manually but the file is almost empty! The only part copied to my logfile is this: Gurobi 9.0.1 (win64) logging started 04/22/20 14:49:32Changed value of param...

Vincent created a post,
Why does MIPFocus value change the optimal solution?
Hi,  When I select MIPFocus=1, the optimal solution is equal to 1.79542 with 0.0000% gap. When I select MIPFocus=3, the optimal solution changes to 1.75932 with 0.0000% gap. I cannot understand w...

Vincent commented,
Thanks, Eli Towle! I've already tried that but, other than the degrade in the first and second objectives, there is another downside. When I add a constraint to the second or third objective to dis...

Vincent created a post,
How to add a constraint only to a single step of a hierarchical optimization?
AnsweredI have a model with three objectives and defined three environments (env1, env2, and env3) for each pass. I am solving this multiobjective problem with a hierarchical approach and wondering if ther...