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Yet Another Math Programming Consultant
28  mars     17h49
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 this map.See: Peter Gleick and Matthew Heberger, American Rivers: A Graphic, https...
10  février     16h58
Math vs Programming
   nbsp;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 ....
08  février     22h28
Small non-convex MINLP: Pyomo vs GAMS
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30  janvier     13h10
One nonzero in set of free variables
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16  janvier     17h01
Informs Test of Time Award for CONOPT paper
   The Test of Time Award for papers published in the INFORMS Journal on Computing in the years is awarded toCONOPT: A Large Scale GRG CodeArne Stolbjerg DrudORSA Journal on Computing : , As Arne notes in , he is helped a bit by the fact that CONOPT...
08  janvier     14h51
GAMS listing file: missing Unicode support
   Newer versions of GAMS allow UTF 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...
04  janvier     14h35
String Art
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20  novembre     04h56
Grouping items: a difficult combinatorial problem
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21  octobre     11h49
Scheduling Team Meetings
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20  octobre     10h54
GAMS: SMAX and sparsity
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19  octobre     07h11
Plotting NUTS-2 maps from GAMS
   nbsp;NUTS regions are statistical subnational regions often provinces , mainly for the EU and UK . NUTS hierarchy from In we can find mapping information in the form of Shapefiles and related formats. I used the GeoJSON format, and created a Python notebook script to...
05  octobre     08h20
Linear Programming Nonsense?
   . Inventory balance constraints MathJax.Hub.Config CommonHTML: scale: ; table.xyz table layout: fixed; border collapse: collapse; margin left:auto; margin right:auto; table.xyz th, table.xyz td border: px solid black; ...
28  septembre     01h00
Math and ChatGPT
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20  septembre     13h09
Julia vs Python
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05  septembre     03h00
Critiquing a GAMS Model
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29  août     22h51
Three-level Matrix Balancing
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04  août     05h32
Some TSP MTZ experiments
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12  juillet     18h44
Coloring edges of a grid
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06  juillet     16h21
A Julia thingy
   nbsp;In Julia, we can write x instead of x. Not the most earth shattering. But a bit special nonetheless.The expression in the last cell is interpreted as a function call.
02  juillet     21h59
Some confusion here
   Sometimes you end up visiting strange sites. This is a question amp; answer site. The question is:Obviously, this is not a good question. It is something like what is the difference between a ham sandwich and butter .The answers are not so good either. Simple X Spelled like this, one...
27  juin     08h27
CVXPY DCP errors
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10  mai     17h56
Generate all solutions that sum up to one
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07  mai     07h29
Finding common patterns
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02  mai     12h41
Solving as network with lowerbounds
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26  avril     17h42
A large MIP model that should be solved as LP: the root node
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