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.

Thursday, August 30, 2012

Cplex QP problems

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For a reasonable sized continuous QP problem, the default Cplex settings indicate problems: Reading data... ...
Thursday, August 23, 2012

Not such a good example data set

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In the paper Hybrid Approach for Machine Scheduling Optimization in Custom Furniture Industry Juan C. Vidal, Manuel Mucientes, Alb...
Wednesday, August 22, 2012

The Comparative Productivity of Programming Languages

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http://www.drdobbs.com/jvm/the-comparative-productivity-of-programm/240005881 I would have expected programmers to be about as efficient i...
2 comments:
Sunday, August 19, 2012

Surprises in the log file

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Sometimes I see messages in the log file of a MIP solver that are quite worrying. Here is one from GAMS/Cplex: Proven...

Problems reproducing results

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In quite a few cases I have been unable to reproduce published results. Here is an example. (Update: actually the presented results are corr...
3 comments:
Saturday, August 11, 2012

Infes and Nopt

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GAMS flags rows and columns in the solution by NOPT or INFES if they are non-optimal or infeasible. The NOPT basically signal the marginal o...
Friday, August 10, 2012

Error messages vs format strings

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Sometimes we see sloppy handling of error messages where format strings are popping up. Of course those form strings should not be displayed...
Friday, August 3, 2012

Javascript: adding array methods

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I used a.indexOf(“a”) to find the position of “a” inside an array. Turns out this an extension not supported by Internet Explorer. But fro...
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Erwin Kalvelagen
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