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GAMS listing file: missing Unicode support
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...
View ArticleInforms Test of Time Award for CONOPT paper
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...
View ArticleOne nonzero in set of free variables
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View ArticleSmall non-convex MINLP: Pyomo vs GAMS
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Math vs Programming
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.
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Water
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...
View ArticleInstead of integers use binaries
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View ArticleLP in statistics: The Dantzig Selector
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View ArticleRounding inside an optimization model
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View ArticleModeling surprises
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Another very small but very difficult global NLP model
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Inflation is a difficult concept for many
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View ArticleRevised Simplex LP Solver written in GAMS
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...
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Circle Packing and HTML reporting
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N-queens and solution pool
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Multiple Solutions in Minimum Spanning Tree example
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Solving DEA Models with GAMS
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CSV readers mutilating my data
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Prevent Loops in GAMS
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...
View ArticleGAMS 48 tests
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View ArticleEquity in optimization models
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View ArticleNon-convex Quadratic Integer Programming
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View ArticlePuLP surprises
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,...
View ArticleSorting using a MIP model
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