**Revolutions**, and kindly contributed to R-bloggers)

In case you missed them, here are some articles from last month of particular interest to R users.

We announced the availability on YouTube of "What is R", a 4-part video based on a recent webcast I hosted.

We announced a webinar I hosted on REvolution’s debugger for R (a recorded replay is now available).

We linked Salvio Rodrigues at the Open Source blog, who found that Robert Gentelman’s appointment to the REvolution Board was "a great impetus … to look at R again".

We reviewed an application of R to create social networks from 10Gb of phone call data.

We linked to a slide presentation by Ryan Rosario explaining the base graphics system in R.

We updated a previous geographic visualization of an election, illustrating that color scales do matter.

We noted the great lineup for R/Finance 2010 in Chicago (register now!).

We reviewed CRAN packages released and updated in January & February.

We linked to information about Frank Harrell’s rms and Hmisc packages, and his upcoming course.

We linked to a story about creating a cluster in Amazon EC2 for parallel computations with the multicore package.

We gave some examples of creating pretty HTML and LaTeX tables with the xtable package.

We showed how to create a mosaic plot (or treemap) in R.

We noted media attention for the R Project, named as 2010 Editor’s Choice at Intelligent Enterprise.

We noted that Tex Hull, co-founder of SPSS, has joined the team at REvolution Computing.

We linked to Dirk Eddelbuettel’s presentation about the Rcpp interface for C++ code in R.

We linked to some useful tips on speeding up R code with the Rprof function.

We linked to a useful introduction to R’s basic object types (vectors, data frames, etc.)

We linked to a Sudoku solver for R (using a different method than the sudoko package)

Other non-R-specific posts in the past month covered a newspaper miscalculating a simple probability, the fate of the employees of the collapsed megabanks and (on a lighter note) Carl Sagan singing again, this time about evolution, and visualizing what happens when you reply-all to an email list.

The R Community Calendar has also been updated.

As always, thanks for the comments and please send any suggestions to me at [email protected]. Don’t forget you can follow the blog using an RSS reader like Google Reader, or by following me on Twitter (I’m @revodavid). You can find roundups of previous months here.

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