Vincent
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Activity overview
Latest activity by Vincent-
Vincent commented,
Thanks very much for your quick and detailed response.
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Vincent created a post,
Merging a binary decision variable with a continuous variable (semi-binary/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...
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Vincent commented,
Hi Matthias, Thanks for your help. Is the itertools.product method faster than the first one? Thanks,Vincent
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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...
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Vincent commented,
That was actually the issue! Thank you Danial Ramin.
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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...
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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...
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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...
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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...