February 2015

The HP Workshop on Distributed Computing in R

February 12, 2015 | Joseph Rickert

by Joseph Rickert In the last week of January, HP Labs in Palo Alto hosted a workshop on distributed computing in R that was organized by Indrajit Roy (Principal Researcher, HP) and Michael Lawrence (Genentech and R-core member). The goal was to bring together a small group of R developers ... [Read more...]

Cache Rules Everything Around Me

February 12, 2015 | wrathematics

Title with apologies to the Wu-Tang Clan. In this post, we're going to be discussing: Rcpp R's C interface The importance of CPU caches Performance benchmarking If none of these things is of interest you and you clicked anyway, please enjoy this picture of a cat: Background Cache is like ... [Read more...]

MazamaSpatialUtils Package

February 11, 2015 | Jonathan Callahan

This entry is part 15 of 15 in the series Using RMazama Science has just released its first package on CRAN — MazamaSpatialUtils. Here is the description: A suite of conversion scripts to create internally standardized spatial polygons dataframes. Utility …   read more ... [Read more...]

R among top languages on GitHub

February 11, 2015 | David Smith

The site githut.info provides quarterly statistics on programming language activity on GitHub, by number of repositories, pushes, forks etc. Ranked by number of active repositories on GitHub, R is the 12th most popular programming language as of Q4 2014. JavaScript, Java and Python appear as the top 3 in the same ... [Read more...]

Make your R plots interactive

February 11, 2015 | Petr Simecek

As a part of my daily job, I draw scatterplots, lots of them. And because there are thousands of genes expressed in any mouse or human tissue, my typical plot looks something like this (code). (Actually, it is a comparison of variance that can be attri...
[Read more...]

EdinbR: A new R usergroup for Edinburgh

February 11, 2015 | benjaminlmoore

Inspired by succesful RUGs like LondonR and CambR, I’m pleased to announce a new R usergroup for those in and around Edinburgh: EdinbR! Edinburgh has a large research community using R, spread across different campuses and even universities so a … Continue reading →
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More on Quadratic Programming in R

February 10, 2015 | Ryan Walker

This post is another tour of quadratic programming algorithms and applications in R. First, we look at the quadratic program that lies at the heart of support vector machine (SVM) classification. Then we'll look at a very different quadratic programming demo problem that models the energy of a circus tent. ... [Read more...]

More on Quadratic Progarmming in R

February 10, 2015 | Ryan Walker

This post is another tour of quadratic programming algorithms and applications in R. First, we look at the quadratic program that lies at the heart of support vector machine (SVM) classification. Then we'll look at a very different quadratic programming demo problem that models the energy of a circus tent. ... [Read more...]

Autocommit with ceODBC is slow

February 10, 2015 | Andrew Z

You already know that a SQL INSERT is faster with bulk loading than inserting a record at a time, but what about the effect of autocommit on performance? While this is probably not specific to ceODBC, using autocommit is astonishingly slow. Here is how slow. First, the Python code to ... [Read more...]

BayesFactorExtras: a sneak preview

February 10, 2015 | Richard Morey

Felix Schönbrodt and I have been working on an R package called BayesFactorExtras. This package is designed to work with the BayesFactor package, providing features beyond the core BayesFactor functionality. Currently in the package are:Sequential Bayes factor plots for visualization of how the Bayes factor changes as data ... [Read more...]

Geomorph To Feature At SVP 2015

February 10, 2015 | Emma Sherratt

Calling Palaeontology-based Morphometricians,I am pleased to announce that myself, along with Aki Watanabe and Marc Jones will be leading a Symposium and associated workshop on Geometric Morphometrics in Paleontology at the Annual Meeting for the Society of Vertebrate Paleontology in Dallas Texas October 2015.Podium Symposium: The Shape of Things ... [Read more...]

rcrunchbase – An API Interface to CrunchBase

February 10, 2015 | Joseph Rickert

James Peruvankal Sr. Program Manager, Revolution Analytics Information about the technology business ecosystems is valuable to both established companies as well as startups. Fortunately CrunchBase - the world’s most comprehensive dataset of startup activity, captures quite a bit of such information. Founded in 2007 by Mike Arrington, CrunchBase began as ... [Read more...]
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