Nick Fryganiotis
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Activity overview
Latest activity by Nick Fryganiotis-
Nick Fryganiotis commented,
Hi Riley,Thank you very much for the clarification.Is there a recommended way to declare these variables—given that they may be continuous—in order to minimize the solver’s execution time?Best rega...
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Nick Fryganiotis commented,
Hi Riley, within this google drive folder you can find the m.mps, and the m_relaxed.mps. The m.mps is when the product is modelled as a binary variable, while the m_relaxed.mps is when the product ...
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Nick Fryganiotis created a post,
Gurobi MILP convergerce
AnsweredI am solving a Mixed-Integer Linear Program (MILP) using Gurobi that includes the linearization of a product term, $\mathbf{u = x \cdot y}$, where $x$ and $y$ are binary decision variables. I found...
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Nick Fryganiotis commented,
Ok, let us consider that $x \in {0,1,\dots, W\}, the acceptable values for the integer variables ($W$ may be equal to $\infty$). The relaxation mechanism transforms the aforementioned set into a co...
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Nick Fryganiotis commented,
Hi Ryuta,Thank you for answering. What i am trying to figure out is, if \(x^*\) is the optimal solution of an integer program with a convex objective function, does there exist a standard relation ...
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Nick Fryganiotis created a post,
Integer Program - LP relaxation for convex objective function
AnsweredIs there any way to bound for each decision variable the difference of the optimal solution of the integer program and the linear program relaxation solution, in case of convex functions?
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Nick Fryganiotis created a post,
Product of integer and binary linearization
AnsweredHi, consider the product of a binary variable x, with an integer variable y. How to efficiently linearize this term? Also is it is better to linearize this term, or gurobi solver can handle it? Th...
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Nick Fryganiotis commented,
Hi Riley, thanks for the answer. In my source code m.update() is prior to m.getQConstrs(). - Nikos
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Nick Fryganiotis created a post,
MILP bilinear constraints
Awaiting user inputI have a mixed integer linear program. My objective function involves the sumation of binary variables and quadratic terms of continuous variables. When i execute the model optimize function i get ...
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Nick Fryganiotis created a post,
Douple vtype for variable created by addVars
AnsweredCould i define 3-index variable using addVars where for the first index when it's value is less than 2 it will be a binary variable, otherwise it will be a continuous varible.