Monthly Archives: April 2010

Parallel Multicore Processing with R (on Windows)

April 21, 2010
By

Parallel Processing backend for R under windows - installation tips and some examples.

Read more »

Little R == r

April 21, 2010
By

There's big R, the R that I use to do most my work, the environment that makes pretty graphics, et. al. It's like matlab, only cooler. Or more cool. Or less uncool. You can see my prejudices here. Today i discovered little R. It's like big R, only little. Holy shit. Dirk gives...

Read more »

Experiments with igraph

April 21, 2010
By
Experiments with igraph

Networks – social and biological – are all the rage, just now. Indeed, a recent entry at Duncan’s QOTD described the “hairball” network representation as the dominant cultural icon in molecular biology. I’ve not had occasion to explore networks “professionally”, but have always been fascinated by both networks and the tools used to analyse them.

Read more »

R / Finance 2010 presentations

April 20, 2010
By

Last Friday and Saturday the second R / Finance conference took place in Chicago on the UIC campus. As a co-organizer, it was a great pleasure to see so many users of R in Finance---from both industry and academia---come to Chicago to discuss and sh...

Read more »

Book Review – ggplot 2: Elegant Graphics for Data Analysis by Hadley Wickham (Springer 2009)

April 20, 2010
By
Book Review – ggplot 2: Elegant Graphics for Data Analysis by Hadley Wickham (Springer 2009)

Order this book from Amazon This book is written by the author of the ggplot2 package for R, which is a package with a design inspired by the grammar of graphics and can remove some of the effort required to put together impressive graphs. The book is just under 200 pages and covers a

Read more »

Data I/O performance tips

April 20, 2010
By

The R tag on StackOverflow recently topped 1000 questions, and continues to be a great community resource for practical tips on using the R language for data analysis and visualization. To take one example, "Efficiency of operations on R data structures" has been answered with some great tips on efficiently getting data in and out of the R system....

Read more »

R and the Next Big Thing

April 19, 2010
By

I've been travelling for the past few days (for the R/Finance 2010 conference in Chicago), so I'd missed much of the reaction to AnnMaria De Mars' article last week where she claimed that "R is an epic fail". Understandably, that inflammatory statement provoked many reactions from the R community on Twitter and in the blogosphere. (I suspect the fact...

Read more »

A stateful C function for R: parsing Fasta sequences

April 19, 2010
By

In the following post, I'll create a C extension for R. This extension will iterate over all the FASTA sequences in a file and will return a pair(name,sequence) for each sequence, that is to say that I won't store all the sequences in memory.The C code...

Read more »

Converting Alpha-Shapes into SP Objects

April 19, 2010
By
Converting Alpha-Shapes into SP Objects

Just read about a new R package called alphahull (paper) that sounds like it might be a good candidate for addressing this request regarding concave hulls. Below are some notes on computing alpha-shapes and alpha-hulls from spatial data and converting the results returned by ashape() and ahull() into SP-class objects. Note that the functions...

Read more »

R and Tolerance Intervals

April 19, 2010
By

Confidence intervals and prediction intervals are used by statisticians on a regular basis. Another useful interval is the tolerance interval that describes the range of values for a distribution with confidence limits calculated to a particular percentile of the distribution. The R package tolerance can be used to create a variety of tolerance intervals of

Read more »

Sponsors

Mango solutions



RStudio homepage



Zero Inflated Models and Generalized Linear Mixed Models with R

Quantide: statistical consulting and training

datasociety

http://www.eoda.de





ODSC

ODSC

CRC R books series





Six Sigma Online Training









Contact us if you wish to help support R-bloggers, and place your banner here.

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)