
A.Omidi
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Posts
Votes on activity by A.Omidi-
Branch and price example
AnsweredHello everybody, Are there any B&P Java example using Gurobi? Regards Omidi. A
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Adding the callback function
AnsweredDear support team, I hope you are doing well. I am trying to count the number of different solutions to a problem and have some issues. If I write a problem as an LP format, like \(z_a + z_b = 5\...
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Is there a preference to use Convex-hull reformulation instead of the BigM constraints?
OngoingDear support team, I am trying to work on a scheduling problem based on its polyhedron reformulations. For that, I would like to reformulate a BigM model into its equivalent Convex hull, (CH), for...
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Linearizing factorial function
AnsweredDear community team, I'm trying to write a constraint in the following form: $$(a_j * (s_j!)) / L \leq 1-\gamma$$ Where \(\texttt{a}\) and \(\texttt{gamma}\) are constants and \(\texttt{s}\) and \(...
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Using Gurobi heuristic parameter to achieve a feasible solution
AnsweredDear support team, I'm working on an optimization problem (MIP) which in the medium/large scale takes too much time to solve optimality. Then I tried to use Gurobi heuristic parameter to invoke a f...
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MIP-Heuristic as a MIP-start
AnsweredDear support team, I'm trying to solve a scheduling problem using Gurobi 9. The model is solved and the optimal solution is found. Now, I would like to use a heuristic (which an instance could be...
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Gurobi NEOS issue
AnsweredDear support team, I'm trying to solve a large scale optimization problem using Gurobi solver (V.9) on my local machine. As I have not accessed to an academic licence for Gurobi, I will need to u...
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Special knapsack problem
AnsweredDear community team, I have tried to solve a special knapsack problem which contains an inequality with binary parameters. AFAIK, cover cuts families can be applied to solve the standard knapsack ...
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Separating specific cuts
AnsweredDear support team, I was trying to solve a MIP using Gurobi and Java. I will need to turn off all pre-solving, heuristics and separating options and solve the problem using pure Branch and Bound. T...
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Relaxed variable in Java API
AnsweredHello support team, I define an integer variable as following: GRBVar[][] start = new GRBVar[mach.length][item.length]; for (int m = 0; m < mach.length; m++) { for (int k = 0; k < item.leng...