Yet Another Math Programming Consultant

I am a full-time consultant and provide services related to the design, implementation and deployment of mathematical programming, optimization and data-science applications. I also teach courses and workshops. Usually I cannot blog about projects I am doing, but there are many technical notes I'd like to share. Not in the least so I have an easy way to search and find them again myself. You can reach me at erwin@amsterdamoptimization.com.

Sunday, June 17, 2012

Good polling is difficult

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From the Huffington Post, a surprisingly detailed exposé on non-response in polling on the US precedential race: http://www.huffingtonpost.c...
Tuesday, June 5, 2012

Multiple solutions

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Many questions are posed about finding a number or all optimal solutions of an LP / MIP problem. Of course this is not always a well-defined...
Wednesday, May 23, 2012

Solver Foundation Enterprise

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I would have expected a more formal announcement than just this: http://social.msdn.microsoft.com/Forums/en-US/solverfoundation/thread/aed...
Friday, May 18, 2012

Model improvements

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Looking at the models used in the paper http://www.ime.usp.br/~egbirgin/publications/rob.pdf I noticed that a few standard “improvements” c...
1 comment:
Friday, May 4, 2012

Gurobi version 5.0 is out

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New Features and Enhancements Some of the new additions and enhancements include: New QCP and MIQCP solvers - Allow you to solve qua...
Thursday, May 3, 2012

Binary OR

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Is it possible to implement a kind of a boolean addition to binary variables. For example: Let X, Y and Z be bin...
2 comments:
Sunday, April 29, 2012

Longest flow shop (2)

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Permutations in GAMS This is a follow up to http://yetanothermathprogrammingconsultant.blogspot.com/2012/04/longest-flow-shop.html . We ...
3 comments:
Monday, April 23, 2012

Longest flow shop

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I was trying to demonstrate some simple scheduling models. The permutation flow shop has an obvious first solution: run jobs in the order g...
Thursday, April 19, 2012

Model is infeasible or unbounded

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My favorite return code from an LP/MIP solver is: MIP status(4): Model was proven to be either infeasible or unbounded. Come on guys...
9 comments:
Sunday, April 15, 2012

Parallel GAMS jobs (2)

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In http://yetanothermathprogrammingconsultant.blogspot.com/2012/04/parallel-gams-jobs.html I described a simple approach I suggested to a c...
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Erwin Kalvelagen
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