"The R-Files" is an occasional series from Revolution Analytics, where we profile prominent members of the R Community. Name: Jeroen Ooms Background: Ph.D. Candidate, Statistics, UCLA Nationality: Netherlands Years Using R: 3 1/2 Known for: Developing web applications for popular R packages including ggplot2, lme4, stockplot and irttool Jeroen Ooms is ... [Read more...]

My neighbour is an half-retired entrepreneur who still runs his electric engine company. A few weekends ago, he came to me with the following physics question related with one of those engines: given a primary disk rotating at the angular speed of ω0 and a secondary disk located on the first ... [Read more...]

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There are any number of short tutorials on making add on R packages on your Windows machine. This is yet another version of that process. I’ve explained what I did in 10 easy steps on the pages, but I’ll give a brief overview here. In the first step I ... [Read more...]

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In the 2011 edition of the Sybase Capital Markets Guide, Revolution Analytics CTO David Champagne talks about the need for up-to-date analytics in Finance, and how you can integrate Revolution R with quality real-time data sources. Here's an excerpt: R represents a radically different approach to the challenges posed by analyzing ... [Read more...]

Just got an email linking to Reproducible Research: A Range of Response, in the new journal Statistics, Politics, and Policy 2(1) by David Banks, who is also the journal's editor. Interestingly, the commentary doesn't mention the journal's policy (if one exists) on the reproducibility of research submitted there. Banks' writing is ... [Read more...]

One of the routine tasks palaeoecologists do is plot data on species composition or geochemical proxies say along a sediment core or stratigraphic sequence. These diagrams are the canonical way of displaying stratigraphic data in this field. An example of … Continue reading → [Read more...]

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In undergrad I had a computer science professor that piqued my interest in applied mathematics, beginning with Conway’s Game of Life. At first, the Game of Life (not the board game) appears to be quite simple — perhaps, too simple — but it has been widely explored and is useful for ... [Read more...]

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In preparation for a talk, I updated Knuth's original diagram in Donald E. Knuth. Literate programming. The Computer Journal, 27(2):97–111, May 1984. The new diagram is Sweave specific. Click the Sweave diagram for a PDF version, or right-click and select 'save image as' for the PNG version. Permission is granted for any ... [Read more...]

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It seems that Rserve works in a 1 byte charactersystem. This was giving us strange results. When I read in data from KNIME with strange characters like µ the errors began. Every time I used the character “µ”, my output in Rserve would be:... [Read more...]

Last week I pushed an update of my analogue package to CRAN. The last release (0.6-23) was on CRAN sometime in Mar 2010 so an update was well overdue. This (0.7-0) is a major update to analogue containing lots of … Continue reading → [Read more...]