David Mejía
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Latest activity by David Mejía
David Mejía commented,
Thanks! David

David Mejía created a post,
PWL approximation of trigonometric functions
AnsweredDear Gurobi Community, Short question. When using addGenConstrSin(x,y) or addGenConstrCos(x,y), should the variable x be in radians or degrees? Thanks for your help.

David Mejía created a post,
quicksum contraint slows solver.
AnsweredHi, I´m working in a MILP model. It solves relatively fast within 10 to 15 minutes. But after adding the following two constraints, the solver takes about 4 days to solve the problem. Any idea why...

David Mejía commented,
Thank you for that explanation Matthias. It just seemed too good to be true. Best Regards, David

David Mejía commented,
Thank you Eli for your fast response. I´ve tried your hint. When I use either MIPFocus=1 or Heuristics=0.1 the solver finds a solution really fast, but no nodes where explored during the optimizati...

David Mejía created a post,
Solver takes to long too find Incumbent solution
AnsweredHi, I´m trying to solve a MILP problem with quadratic constraints. The solver is taking a fairly long time finding a incumbent solution. When it finds it, it´s when the optimization is done. The be...

David Mejía commented,
Hi Eli, Thank you so much for your help, that answered my question!

David Mejía created a post,
implement conditional constraint
AnsweredHi, I´ve been trying to implement this constraint: if a >=1 then b=1 else b =0 a is a continuous variable b is a binary variable I´ve seen people using the big M to express this, but I can´t get ...

David Mejía commented,
Thank you so much for the advice, it worked out perfectly. David

David Mejía created a post,
define a deterministic set of feasible solutions
AnsweredHi, How can I define a deterministic set of feasible solutions for a variable? For example the solver can only find a solution in the following set of solutions for the variable x: x ∈ {0.1,0.2,0...