Yet Another Math Programming Consultant
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Formulating optimization models inside traditional programming languages such as Python is very popular. The main tool the developers use to make this possible is operator overloading. There are cases, where we can write code that looks somewhat reasonable, is accepted and processed without any warning or error messages, but is total nonsense. In...
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This book [1] on DEA models has an accompanying website with all the GAMS models [2]. Of course, I'll be doing some nitpicking on the GAMS code. In some of the GAMS code, unneeded loops are used. From [3]: The inner loop is not needed. We can write this as:Many beginning GAMS modelers use too many explicit loops. Most likely because they are used...
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I am teaching some GAMS classes, and a question arose: "How does the Simplex method work?" It's not easy to answer in a few sentences, but I want to touch upon the concept of a basis anyway. Once you have a good intuition of what a basis is, a simple Simplex method is not so far-fetched. I find the tableau presentation somewhat confusing and far...
Presentation at USDA-ERS Model Summit 2024.
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Fascinating map with annual water throughput. This is related to water availability for irrigation. An important topic.The Rio Grande is not so grand here.It must not be completely trivial to produce this map.See: Peter Gleick and Matthew Heberger, American Rivers: A Graphic, https://pacinst.org/american-rivers-a-graphic/
A programmer writes about this blog:(It is old, but I just came across this).In my previous post, I just argued the other way around. To make sure: I don't hate programmers.BTW, in quite a few programming languages for loops are very slow, and need to be replaced by something like sum(). Examples: Python, R, SQL.
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The Test of Time Award for papers published in the INFORMS Journal on Computing in the years 1993–1997 is awarded toCONOPT: A Large-Scale GRG CodeArne Stolbjerg DrudORSA Journal on Computing 6(2):207–216, 1994 As Arne notes in [1], he is helped a bit by the fact that CONOPT users may want to cite a published paper (and because there is no newer...
Newer versions of GAMS allow UTF-8 encoded strings as labels. That is very welcome, as these labels may come from data sources that just use Unicode characters. However, when printing to the listing file, we miss proper Unicode support. At first, I thought, "OK, just a few misaligned tables. No big deal." Here is a constructed example showing...
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