Ronald van der Velden
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Gurobi Staff
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Activity overview
Latest activity by Ronald van der Velden-
Ronald van der Velden commented,
Official comment Hi David,Consider setting the MIPGap parameter to 0.005 before solving. This will tell Gurobi to stop as soon as it finds a gap of 0.5%. You can then access the solution and the ObjVal and ObjBound...
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Ronald van der Velden created an article,
How do I use Gurobi with PuLP?
PuLP is one of the modeling frameworks that support Gurobi. In this article, we describe how to use Gurobi through PuLP. For more information, or when you encounter PuLP-related issues, please have...
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Ronald van der Velden created an article,
How do I use Gurobi with Pyomo?
Pyomo is one of the modeling frameworks that support Gurobi. In this article, we describe how to use Gurobi through Pyomo. For more information, or when you encounter Pyomo-related issues, please h...
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Ronald van der Velden created an article,
How do I benchmark my existing model with Gurobi?
Since Gurobi is essentially a library for performing mathematical optimization, it will always be integrated in an application. The first benchmark in benchmarking Gurobi against other solvers is t...
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Ronald van der Velden created an article,
What to measure during benchmarking?
When you're evaluating Gurobi, there are several things you could measure as a way to quantify performance. In fact, there is not one correct answer to the question in the title of this article. In...
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Ronald van der Velden commented,
So why Gurobi reject this as a initial solution? This you can learn by fixing the solution (set the lowerbound and upperbound of each variable equal to the start solution) and asking Gurobi to op...
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Ronald van der Velden commented,
Hi, this problem might occur if there are constraints around the boundary between the two years (e.g. if you have 3 shifts in a workforce puzzle on Dec 29-31 and 3 shifts on Jan 1-3, but maximum fi...
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Ronald van der Velden commented,
Hi, You could use the ResultFile parameter to specify where Gurobi should store a logfile while solving your model. It would also contain information about the method used to solve your model (e.g....
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Ronald van der Velden commented,
Ah, the fact that there's a variable on the left side does not allow a quick fix. Still, you could try multiplying both sides by \[max_{j,l,k}^{box}\] to see if this improves performance. I'm assum...
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Ronald van der Velden commented,
Hi Eugene, You could do something like this: import gurobipy as gpfrom gurobipy import GRBH = range(3)K = [7, 13, 16]with gp.Env() as env, gp.Model(env=env) as model: V = model.addVars(H, name='...