Pieter Bots
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Activity overview
Latest activity by Pieter Bots-
Pieter Bots commented,
Hi Riley,The slack variable is what I'm finding unusual, and I not understanding the motivation for.Without slack, the solver finds the problem to be infeasible when X is near-zero. When I modify m...
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Pieter Bots commented,
Hi Riley,Thanks for your quick response and for your comments. In a way, I'm glad that you agree that it looks like a bug, rather than a modelling mistake.In reply to your first two comments: indee...
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Pieter Bots created a post,
Setting IntegralityFocus=1 leads to (very) suboptimal solution when "manually" implementing SOS1
AnsweredHello!Following up on Riley's helpful comments, I've improved on my method to make a robust distinction between X<0, X=0 and X>0 for continuous variables having lower bounds < 0. I need this distin...
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Pieter Bots commented,
Hi Riley,I've run 20 replications for both treatments (with semi-continuous variables and without) using the same series of different seed parameter values. As you suggested, I first analyzed the l...
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Pieter Bots commented,
Hi Riley,Thanks for your thoughtful comments. Indeed, I should (and will) run numerous replications with different seed values to (dis)confirm the claims.The high bounds value of 7e+06 follows from...
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Pieter Bots commented,
Hello Ryan,Thank you very much (!!) for your detailed answer. It is most helpful for me to know how Gurobi (presolve) deals with semi-continuous variables and SOS1 constraints. It has allowed me to...
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Pieter Bots created a post,
Semi-continuous variable near-zero bound violation: does Gurobi always consider S-C variables first to resolve infeasibility?
AnsweredHello! I pose this question out of curiosity, not because I suspect a bug or flaw in the model. Some of my students are modeling batch processes in a steel mill using Linny-R (graphical MILP model...