May 2015

rfoaas 0.1.6

May 31, 2015 | Thinking inside the box

After a few quiet months, a new version of rfoaas is now on CRAN. As before, it shadows upstream release of FOAAS from which carried over the version number 0.1.6. The rfoaas package provides an interface for R to the most excellent FOAAS service--which provides a modern, scalable and RESTful web ... [Read more...]

Automatic pitch extraction from speech recordings

May 31, 2015 | Eryk Walczak

I needed to extract mean pitch values from audio recordings of human speech, but I wanted to automate it and easily recreate my analyses so I wrote a couple of scripts that can do it much faster. Here is a recipe for extracting pitch from voice recordings.   Cleaning audio files ... [Read more...]

Paper Helicopter Experiment, part III

May 31, 2015 | Wingfeet

As final part of my paper helicopter experiment analysis (part I, part II) I do a reanalysis for one more data set. In 2002 Erik Erhardt and Hantao Mai did an extensive experiment, see The Search for the Optimal Paper Helicopter. They did a number of s... [Read more...]

A new R package for detecting unusual time series

May 30, 2015 | Rob J Hyndman

The anomalous package provides some tools to detect unusual time series in a large collection of time series. This is joint work with Earo Wang (an honours student at Monash) and Nikolay Laptev (from Yahoo Labs). Yahoo is interested in detecting unusual patterns in server metrics. The basic idea is ... [Read more...]

Lessons learned in high-performance R

May 30, 2015 | [email protected]

On this blog, I've had a long running investigation/demonstration of how to make a "embarrassingly-parallel" but computationally intractable (on commodity hardware, at least) R problem more performant by using parallel computation and Rcpp. The example problem is to find the… Continue reading → [Read more...]

Reproducibility breakout session at USCOTS

May 30, 2015 | mine

Somehow almost an entire academic year went by without a blog post, I must have been busy… It’s time to get back in the saddle! (I’m using the classical definition of this idiom here, “doing something you stopped doing for a … Continue reading → [Read more...]

Cracking Safe Cracker with R

May 30, 2015 | tylerrinker

My wife got me a Safe Cracker 40 puzzle a while back. I believe I misplaced the solution some time back. The company, Creative Crafthouse, stands behind their products. They had amazing customer service and promptly supplied me with a … Continue reading →
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Modeling Contagion Using Airline Networks in R

May 30, 2015 | Benevolent Planner

I first became interested in networks when reading Matthew O’Jackson’s 2010 paper describing networks in economics. At some point during the 2014 ebola outbreak, I became interested in how the disease could actually come to the U.S. I was caught up with work/classes at the time, but decided ...
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Hosting Shiny on Amazon EC2

May 30, 2015 | Andrew Collier

I recently finished some work on a Shiny application which incorporated a Random Forest model. The model was stored in a RData file and loaded by server.R during initialisation. This worked fine when tested locally but when I tried to deploy the application on I ran into ... [Read more...]

Update on Snowdoop, a MapReduce Alternative

May 29, 2015 | matloff

In blog posts a few months ago, I proposed an alternative to MapReduce, e.g. to Hadoop, which I called “Snowdoop.” I pointed out that systems like Hadoop and Spark are very difficult to install and configure, are either too primitive (Hadoop)  or too abstract (Spark) to program, and above ... [Read more...]

Which Witch is Which

May 29, 2015 | bryce

This post is an elaboration of an iRKernel Notebook which can be found at For a previous article on the iPython Notebook, see here. Every programming language comes pre-packaged with certain basic functions, or methods, that are considered standard. These generally include methods ... [Read more...]

R: the Excel Connection

May 29, 2015 | Mango Solutions

By Andy Nicholls, Head of Consulting As companies increasingly look beyond the scope of what is logistically possible in Excel more and more companies are approaching Mango looking for help with connecting to Excel from R. With over 6,500 packages … Continue reading → [Read more...]

Bio7 2.1 Release Candidate RC2 for MacOSX Available

May 29, 2015 | » R

29.05.2015 I published a MacOSX release candidate for Bio7 2.1 based on Eclipse 4.5 RC2. This release was tested on MacOSX 10.10. The final release will be published after the official Eclipse 4.5 release. Installation: Bio7 2.1 comes as a regular *.dmg installation package. Just drag the to the Applications folder. Bio7 2.1 comes […] [Read more...]

testthat 0.10.0

May 29, 2015 | hadleywickham

testthat 0.10.0 is now available on CRAN. Testthat makes it easy to turn the informal testing that you’re already doing into formal automated tests. Learn more at Install the latest version with: install.packages("testthat") There are four big changes in this release: ... [Read more...]

RStudio 0.99 released

May 29, 2015 | David Smith

If you download R or Revolution R Open, the R interface is pretty stark — you'll get a command prompt, and not much else. That's fine for quick, interactive calculations, but if you need to do any serious scripting or programming in R, you'll need an interactive development environment (IDE) to ... [Read more...]
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