February 2011

RcppArmadillo 0.2.12

February 16, 2011 | Thinking inside the box

A new version 1.1.2 of Conrad Sanderson's Armadillo templated C++ library for linear algebra came out a couple of days ago. This has now been wrapped into a new version 0.2.12 of RcppArmadillo, our Rcpp-based integration into R. The short NEWS fil... [Read more...]

Take the ggplot2 user survey

February 16, 2011 | David Smith

The author of the ggplot2 graphics package for R, Hadley Wickham, is looking for feedback from ggplot2 users. If you've used ggplot2, fill out his short survey at the link below. WuFoo: ggplot2 survey [Read more...]

The Egyptian Revolution, in tweets

February 16, 2011 | David Smith

Twitter played a significant role in the recent uprising in Egypt, with protesters communicating via tweets marked with the #25bahman hastag (February 14 in the arabic calendar) to plan and rally for the demonstration. Michael Bommarito downloaded all such tweets and plotted their frequency over time using R's ggplot2 library: Not ... [Read more...]

Pre-processing text: R/tm vs. python/NLTK

February 16, 2011 | mjbommar

  Let’s say that you want to take a set of documents and apply a computational linguistic technique.  If your method is based on the bag-of-words model, you probably need to pre-process these documents first by segmenting, tokenizing, stripping, stopwording, and … Continue reading → [Read more...]

Twin Cities R User Group Meeting Tonight!

February 16, 2011 | erik

TCRUG will be having a meeting TONIGHT (2/16) at 5:30 PM. We will meet in ROOM 29 in Willey Hall. Willey Hall is located on the West Bank of the Minneapolis campus. See the Google map at http://goo.gl/tnRnU. Erik Iverson will be giving a talk ... [Read more...]

Mapping London’s Population Change 1801-2030

February 16, 2011 | James

Buried in the London Datastore are the population estimates for each of the London Boroughs between 2001 – 2030. They predict a declining population for most boroughs with the exception of a few to the east. I was surprised by this general decline and also the numbers involved- I expected larger changes from ... [Read more...]

Mixed models – Part 2: lme lmer

February 15, 2011 | nzcoops

Getting more into mixed models, I’ve been playing around with both nlme::lme and lme4::lmer. http://tolstoy.newcastle.edu.au/R/e2/help/06/10/3345.html was quite a good post at explaining the differences, which from what I gather is largely performance based when using crossed or partially crossed ... [Read more...]

ABC in London

February 15, 2011 | xi'an

After the very exciting and I think quite successful ABC in Paris meeting two years ago, Michael Stumpf from Imperial College London suggested a second edition in London along the same lines. Michael kindly associated me with the planning of this meeting. It is (logically) called ABC in London (or ... [Read more...]

Rcpp 0.9.1

February 15, 2011 | Thinking inside the box

A new release 0.9.1 of Rcpp went to CRAN and Debian yesterday. This version contains mostly bug-fixes and rather few enhancements. The changes are mostly 'internal fixes' and not user-facing; they mostly address some issues in memory management w... [Read more...]

R 2.12.2 scheduled for February 25

February 15, 2011 | David Smith

The next release of R is scheduled for release February 25, and R 2.12.2 will likely be the final bug-fix release of the 2.12 series before R 2.13 is released in April. According to the NEWS file in the latest daily build, 2.12.2 will improve complex-arithmetic support on some rare platforms that don't support complex ... [Read more...]

Reaching 1000

February 14, 2011 | xi'an

This is the 1000th post on the ‘Og! Here are the entries that have had above 1000 views (not viewers) so far: In{s}a(ne)!! 5,353 “simply start over and build something better” 4,345 Julien on R shortcomings 1,966 Sudoku via simulated annealing 1,762 Of black swans and bleak prospects 1,462 Do we need an ... [Read more...]

R-commander installation in openSUSE

February 14, 2011 | S.S. Rebelious

Thanks to this post I was able to install R-commander in openSUSE.  I've modified recipe a bit and don't want to search for it the next time.You have to perform several steps:Install R-base and R-base-devel packages from here. Install gfortran :~&... [Read more...]
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