Pieter Bots

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...

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...

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...

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...

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...