June 2010

CRAN Search

June 30, 2010 | C

Here's a ditty to search the cran R packages by descriptioncranSearch = function(q=''){  library(XML)  u
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My Experience at Hadoop Summit 2010 #hadoopsummit

June 30, 2010 | Ryan

This week I had the opportunity the trek up north to Silicon Valley to attend Yahoo’s Hadoop Summit 2010. I love Silicon Valley. The few times I’ve been there the weather was perfect (often warmer than LA), little to no traffic, no road rage and people overall seem friendly ... [Read more...]

June 2010 edition of R Journal available

June 30, 2010 | David Smith

The latest edition of the R Journal is now available. This issue includes in-depth articles on the packages IsoGene, glmmBUGS, cshapes, tmvtnorm, neuralnet, glmperm and exactci/exact2x2, plus an example of reproducible research in R. There's also a review of the book A Beginner's Guide to R. The complete ... [Read more...]

Rmetrics slides

June 30, 2010 | romain francois

I presented Rcpp at the Rmetrics conference earlier today, this was a really good opportunity to look back at all the work Dirk and I have been commiting into Rcpp. I've uploaded my slides here (pdf) and on slideshare : Rcpp: Seemless R and C++V... [Read more...]

Rcpp 0.8.3

June 29, 2010 | Thinking inside the box

A new version 0.8.3 of Rcpp is now CRAN and in Debian. It comes about three weeks after the 0.8.2 release. And even though we promised to concentrate on documentation, it contains a raft of new features: The addition of what we dub Rcpp su... [Read more...]

Analyze Gold Demand and Investments using R

June 29, 2010 | C

After the recent foray into stock analysis using quantmod, I thought it worthwhile to mention that the library can be used to analyze a wide variety of investments, including precious metals.  It is also worthwhile to mention that there are other ...
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Entropy augmentation the modulo way

June 29, 2010 | Matt Asher

Long before I had heard about the connection between entropy and probability theory, I knew about it from the physical sciences. This is most likely how you met it, too. You heard that entropy in the universe is always increasing, and, if you’re like me, that made very little ... [Read more...]

Tips for managing memory in R

June 29, 2010 | David Smith

R is an in-memory application, so every new object you create takes up RAM. (Yes, there are ways around that, but that's a topic for another article.) If you're working on a small machine (say, a 32-bit Windows system with 1Gb of RAM or less) you might need to be ... [Read more...]

Sweave.sh in Eclipse-StatET

June 29, 2010 | Gregor Gorjanc

Sébastien Bihorel sent the following instructions on how to use my sweave.sh shell script in Eclipse-StatET. 1- First, you need to know the path to your TEXINPUTS settings. Type R CMD env |grep TEXINPUTS in a shell. In my installation (opensuse 11.2), the shell returned the followingTEXINPUTS=.::/usr/lib/... [Read more...]

Analyze Twitter Data Using R

June 28, 2010 | C

Twitter data available through its API provides a wealth of real time information.  This article demonstrates a graph of user relationships and an analysis of tweets returned in a search using R.  Keep in mind, Twitter has announced that basi...
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Second year of entries!

June 28, 2010 | Nick Horton

Hello, readers new and old!We started adding examples a year ago, in advance of the book's publication. To mark the occasion, we're closing chapter 7 and starting chapter 8 next week. We've crafted a listing of all entries from the first year and mad...
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How to peg 7 cores with doSMP

June 28, 2010 | David Smith

Statistics PhD student Nathan VanHoudnos has an 8-core laptop, and by his own admission, takes "an almost unhealthy pleasure in pushing [his] computer to its limits". It seems like he's found an outlet for this passion with the new doSMP library included with Revolution R, that allows him to use ... [Read more...]

Another harmonic mean approximation

June 26, 2010 | xi'an

Martin Weinberg posted on arXiv a revision of his paper, Computing the Bayesian Factor from a Markov chain Monte Carlo Simulation of the Posterior Distribution, that is submitted to Bayesian Analysis. I have already mentioned this paper in a previous post, but I remain unconvinced of the appeal of the ... [Read more...]

Weekend art in R (Part 2)

June 26, 2010 | Matt Asher

I put together four of the best looking images generated by the code shown here: # More aRt par(bg="white") par(mar=c(0,0,0,0)) plot(c(0,1),c(0,1),col="white",pch=".",xlim=c(0,1),ylim=c(0,1)) iters = 500 for(i in 1:iters) { center = runif(2) size = 1/rbeta(2,1,3)   # Let's create random HTML-style colors color = sample(c(0:9,"... [Read more...]
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