Lukas Barth
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Recent activity by Lukas Barth-
Suspected bug in LP parser: Constraint without variables introduces new variables
AnsweredI think I found a bug in Gurobi 9.0.3. Take this example.lp file: Maximize xSubject To test: 10 >= 5Bounds 0 <= x <= 5Generals xEnd If I run from gurobipy import readm = read('example.lp')print...
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What are postponed nodes?
AnsweredI'm currently optimizing a MIP model, and this is how my MIP log looks like: Nodes | Current Node | Objective Bounds | WorkExpl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time0 0 73...
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Tell Gurobi about optimal variable value depending on a set of other variables
OngoingI'm modelling a scheduling problem (see below for a concrete example). In this problem, I have a set of (integral) variables modelling the start times assigned to jobs. I have a second set of binar...
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Analyzing the conditioning of a MIP
AnsweredHello everyone, I have several different MIP formulations for the same problem, which I am currently benchmarking against each other. One thing I would like to look at is the conditioning of the re...