Articles published in the June 2011 issue
testthat: Get Started with Testing
Hadley Wickham 5
Content-Based Social Network Analysis of Mailing Lists
Angela Bohn, Ingo Feinerer, Kurt Hornik and Patrick Mair 11
Rmetrics - timeDate Package
Yohan Chalabi, Martin Mächler and Diethelm Würtz 19
The digitize Package: Extracting Numerical Data from Scatterplots
Timothée Poisot 25
Differential Evolution with DEoptim
David Ardia, Kris Boudt, Peter Carl, Katharine M. Mullen and Brian G. Peterson 27
rworldmap : a new R package for mapping global data
Andy South 35
Cryptographic Boolean Functions with R
Frédéric Lafitte, Dirk Van Heule and Julien Van hamme 44
Raster Images in R Graphics
Paul Murrell 48
Probabilistic Weather Forecasting in R
Chris Fraley, Adrian Raftery, Tilmann Gneiting, McLean Sloughter and Veronica Berrocal 55
Analyzing an Electronic Limit Order Book
David Kane, Andrew Liu and Khanh Nguyen 64
Giving a useR! Talk
Rob J. Hyndman 69
Tips for Presenting Your Work
Dianne Cook 72