Thomas Leveringhaus
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Votes on activity by Thomas Leveringhaus-
Using CSC or CSR?
Dear Gurobi-Team, I would like to ask whether it makes sense to think about the format in which sparse matrices are transferred to Gurobi? I assume, Gurobi will internally use any of the formats CS...
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partition heuristic and threads
Awaiting user inputDear Gurobi-Team, I set parameter Threads to value 64 so I got: CPU model: AMD EPYC 7502 32-Core Processor, instruction set [SSE2|AVX|AVX2]Thread count: 64 physical cores, 64 logical processors, us...
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Concurrent Optimizer and callbacks
AnsweredDear Gurobi-Team, I am using Concurrent Optimizer and callbacks and it seems to me, that callbacks are not called, although they should (or shouldn't?). In the reference manual (https://www.gurobi....
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confusion about adding MVar.fromlist()
AnsweredDear Gurobi-Team, I tried to use MVar.fromlist() (https://www.gurobi.com/documentation/10.0/refman/py_mvar_fromlist.html) but the given example does not work: import gurobipy as gpmodel = gp.Model(...
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Place constraints back in the lazy constraint pool
AnsweredDear Gurobi team, I would like to ask if it makes sense (or is even possible) to place constraints back in the lazy constraint pool. I understand how they are placed in the lazy constraint pool ini...
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general discrete variables in gurobi
AnsweredDear Gurobi-Team, is there any (direct) way to model general discrete variables in gurobi? What I mean are variables that take ("countable") specific integer or also specific non-integer values, e....
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lazy lower bound and upper bound for Vars
AnsweredDear Gurobi Team, I am trying to speed up the solution of an optimization problem and reduce the size of the problem. I am already using the "lazy" option for some inequality constraints of which I...
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Hyperboloid of two sheets
AnsweredDear Gurobi-Team, if I model the following problem, Gurobi can solve it with GRB.Param.NonConvex=-1, although the Q-constraint-matrix is non-convex (due to the positive and negative eigenvalues of ...
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Interactions between partition heuristic and presolve
AnsweredDear Gurubi Team, if I have two variables x1 & x2 (and others) in my model and x1 and x2 have different attributes with respect to the partition heuristic. Additionally, if I have a constraint (or ...
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bilinear transformation and GRB.Param.NonConvex
AnsweredDear Gurobi-Team, with my questions I refer to your following webinar:https://www.gurobi.com/events/models-with-products-of-binary-variables/ Am I right, that the bilinear transformation is only ap...