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Operations Research : Recent Questions and Answers

Find answers to your questions about Operations Research or help others by answering their Operations Research questions.

Possibility of indexing decision variables with 2 indices using a set of tuples in Pyomo

I am currently attempting to solve a network problem that is not fully connected.Thus, I have attempted to do some preprocessing of data so as to form a set of...

Asked on 11/24/2021

3 answer

View of Constraints and Decision Variables in Pyomo

I have just attempted to construct my first Pyomo model. However, I was unable to locate any documentation that shows how to view constraints, decision variables. As my model is...

Asked on 11/17/2021

1 answer

CPLEX Python API Manual with References

I am currently attempting to code a model using the Python API. However, the IBM Site seems to not have one that is similar in formating and content depth such...

Asked on 11/04/2021

1 answer

Are Python and Julia used for optimization in industry?

I am giving a small computer exercise that aims at teaching students the basics of a modelling language to model small optimization problems. So far I have been using the...

Asked on 08/19/2021

15 answer

How to improve the quality of code in OR?

So I noticed, that a lot of students taking OR-classes come from non-computer science backgrounds (e.g. buissiness administration). They typically had only one other class in their first semester where...

Asked on 08/19/2021

3 answer

How would you characterize "optimization data?"

We often hear that in practice, not enough data of sufficient quality, consistency, recency, etc. is available for feeding into mathematical optimization models. Example: my university wanted to plan/optimize their...

Asked on 08/19/2021 by Marco Lübbecke

4 answer

How to simulate computational execution time?

I am working with some computational experiments with an Integer Programming (IP) formulation over a well-known set of instances from the literature of my problem. And I would like to...

Asked on 08/19/2021 by Matheus Diógenes Andrade

2 answer

Local optimum of dual of non-linear program

In general, suppose you have a non-convex optimization problem with constraints and you form the dual problem. If you find a local optimum for the dual problem, will the corresponding...

Asked on 08/19/2021

2 answer

Combinatorial Optimization using AMPL

I want to solve the following integer programming problem using AMPL. The problem is the following (It was already asked on, but I need...

Asked on 08/19/2021 by user3831

2 answer

Parallel nonlinear solvers

I've noticed that parallel (CPU or GPU) nonlinear programming solvers are few and far between. It seems that if any parallelization is involved at all, it generally applies to solving...

Asked on 08/19/2021 by Josh Allen

3 answer

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