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.

Friday, February 5, 2016

R: The RData File Format

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R has a quite efficient way to store data in a file using its own RData file format. You can save objects to the file using save() and load...
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Thursday, February 4, 2016

Cplex wish list

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Express your most wanted features here: https://www.ibm.com/developerworks/rfe/ . And look what other users want. On top of my list: better ...
Monday, February 1, 2016

Maximum Edge Biclique Problem

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The standard network problems such as shortest path and min-cost flow are easily expressed as linear programming problems. Here is a network...
Wednesday, January 27, 2016

Multi-dimensional Knapsack: Genetic Algorithm vs MIP

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In http://pyeasyga.readthedocs.org/en/latest/examples.html a small example of a knapsack problem is shown. Here it has two constraints inst...
Friday, January 22, 2016

ggplot example

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To produce high-quality plots for a document R’s ggplot is always a good choice: > library(ggplot2) > df<- read.csv("c:\\...
Wednesday, January 20, 2016

Dataframe Pivoting: some timings

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In Pivot a table: GAMS, SQLite, R and Python we described a pivoting operation on a small example. In the comments it was mentioned that fo...
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Erwin Kalvelagen
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