Tobias Völk
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Tobias Völkさんが投稿を作成しました:
Bug? Numerical Issue? Help! Optimal objective value of relaxation is negative despite being the sum of non-negative variables?
ユーザーの入力を待っています。So I was using slack variables (indicating how much a constraint is violated for > 0, = 0 means that the constraint is fulfilled) to find any feasible solution as fast as possible (why doesn't Guro...
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Tobias Völkさんがコメントを作成しました:
The alternative form is what I was looking for, thanks :)
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Tobias Völkさんが投稿を作成しました:
Change objective function during optimization
進行中We cannot use a certain type of cut with Gurobi because it requires the replacement of a part of the objective function in the callback. It would be cool if there was some "on-your-own-risk"-way of...
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Tobias Völkさんが投稿を作成しました:
Query ruled out values for binary variables in callback
回答済みWhen Gurobi knows, that there is no feasible/optimal solution with (binary variable x_3) x_3 = 1, it would be cool if this could be queried during the callback. Not that Gurobi should try to look f...
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Tobias Völkさんが投稿を作成しました:
Proper way to access LP relaxation?
回答済みWhen Gurobi has solved a relaxation during it's Branch & Bound - Algorithm, I would like to look at the solution of the relaxation in order to add a type of cut which we found in a paper. What is t...
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Tobias Völkさんが投稿を作成しました:
Query which binary variables have known values during optimization in order to add additional constraints
回答済みIf it doesn't exist yet, it would be a cool feature to have. Having binary variables x_1, x_2, ... Gurobi does rule out values for variables during optimization, right? For example, if it has deci...
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Tobias Völkさんが投稿を作成しました:
Indicator constraints with arbitrary right-hand-side (Python)
回答済みmodel.addGenConstrIndicator(...) As far as I can see (though that does not mean much of course), there is no reason why the right-hand-side has to be a float. Neither Math nor Python should pose a ...
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Tobias Völkさんが投稿を作成しました:
Optimizing away dummy binary variables with values determined by other variables?
回答済みHi all, we have the following part of our problem formulation: x_t = 1 IFF machine is on at time t ELSE 0 u_t = 1 IFF machine was started (u)p, meaning x_(t-1) = 0 AND x_t = 1 ELSE 0 d_t = 1 IFF ma...
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Tobias Völkさんが投稿を作成しました:
Model too big for academic license
回答済みMe, a curious student, was so so excited to finally have modeled their first optimization problem using Gurobi and thus having found a much faster way to solve their problem for big sizes, soon had...