OR in an OB World

A mix of operations research items and software tricks that I'll probably forget if I don't write them down somewhere.

Wednesday, June 11, 2025

RStudio Republish Menu

I'm a big fan of the RStudio IDE for coding in R, but like all software it has one or two quirks. Someone recently asked about one on ...

Monday, April 28, 2025

Routing With Sequencing

The motivation for this post comes from a sequence of questions posted on OR Stack Exchange (including this one ), having to do with a mixed...

Monday, April 14, 2025

Retaining Libraries During R Upgrades

Today I was able to upgrade R to version 4.5, and was reminded in the process of a tedious "feature" of the upgrade. R libraries a...

Monday, March 3, 2025

Boolean Grid II

As the title implies, this is a sequel to my previous post , to deal with a variety of odds and ends. There's a saying that you cannot t...

Friday, February 28, 2025

A Boolean Grid

A recent blog post by Erwin Kalvelagen discusses a very straightforward integer programming problem. You have a rectangular grid of boolean...

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About Me

Paul A. Rubin: I am Professor Emeritus of Management Science, retired from the Eli Broad College of Business at Michigan State University. My primary research interest is in the application of integer programming models and algorithms. In addition to research interests, I am active in the INFORMS Pro Bono Analytics project.

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