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Linear Programming Nonsense?
1. Inventory balance constraints table.xyz { table-layout: fixed; border-collapse: collapse; margin-left:auto; margin-right:auto; } table.xyz th, table.xyz td { border: 1px solid black; }...
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Plotting NUTS-2 maps from GAMS
NUTS-2 regions are statistical subnational regions (often provinces), mainly for the EU and UK [1]. NUTS hierarchy (from [1])In [2] we can find mapping information in the form of Shapefiles[3] and...
View ArticleGAMS: SMAX and sparsity
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View ArticleScheduling Team Meetings
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Grouping items: a difficult combinatorial problem
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String Art
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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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