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Background (probably boring) Several months ago, my boss and I were discussing how he got the data for his software popularity article; the rest of the background discussion pertains to those plots, so I would recommend going over to take a look before continuing on (or just skip to the ... [Read more...]

Although there is a weighted.mean function in R, so far I couldn’t find a implementation of weighted.var and weighted.t.test – here they are (the weighted variance is from Gavin Simpson, found on the R malining list): ?View Code RSPLUS# weighted … Continue reading → [Read more...]

My head exploded a while ago. Perhaps not my head but my brain was all mushy after working every day of March and first week of April; an explanation—as good as any—for the post hiatus. Back to the post title. … Continue reading → [Read more...]

In this R tutorial you will learn how to work with Google n-gram data sets with the help of MySQL. The complete R code is included in this post. [Read more...]

In my last post I was struggling with getting a big memory version of the distance matrix to work fast. Nick and other readers had some suggestions and after puttering around with Nicks code I’ve adapted it to big memory and not impacted the run time very much. For ... [Read more...]

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To generate an artificial DNA sequence of  "n" bases long with a fixed composition bias in just one line of code, just open your R prompt and type:seqX [Read more...]

This reference card has been written by Tom Short.Click the image to see the R magic:Thank you for your support Tom.Benjamin [Read more...]

What’s the difference between using which() and match() in R? For me - about 10 hours! Today I was doing some string matching in R. In my experience performing any sort of regex or string manipulation in R is a mistake.... [Read more...]

Technologies: SAP HANA, R, HTML5, D3, Google Maps, JQuery and JSONFor this fun exercise, I analyzed more than 200 million data points using SAP HANA and R and then brought in the aggregated results in HTML5 using D3, JSON and Google Maps APIs.  Th... [Read more...]

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Someone recently asked on twitter about about peoples' preferences for cloud generators in R. I replied that I thought the "null" word cloud generator was best. By this I mean that I think the word cloud is a bad visualization method. Why? Here is one article with a good perspective, ... [Read more...]

Data represents all planes (not just commercial planes) for the United States "There are only two emotions on a plane: boredom and terror." -- Orson Welles, interview to celebrate his 70th birthday, The Times of London, 6 May 1985. ... [Read more...]

As anyone who's ever played Civilization[*] knows, the advent of sailboats capable of crossing the oceans leads to an explosion of exploration, commerce and social development. And with the visualization below, you can see that explosion in action: Ben Schmidt used the R language and data recorded in by hand ... [Read more...]

A new study (Ostafin, B. D., & Kassman, K. T, In Press) examined whether mindfulness meditation could help improve participants' insight problem solving skills. Their hypothesis was that mindfulness might aid in solving of problems that require creative, nonhabitual responses. Insight problems These are problems that typically generate an eureka effect (... [Read more...]

In 2010, I presented my universal scalability law (USL) at the SURGE conference. I came away with the impression that nobody really understood what I was talking about (quantifying scalability) or, maybe DevOps types thought it was all too hard (math). Since then, however, I've come to find out that people ... [Read more...]

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Conrad Sanderson has released a new major version 3.0.0 of his excellent Armadillo C++ template library for linear algebra. A corresponding new release 0.3.0 of RcppArmadillo is now on CRAN. This follows four pre-releases of Armadillo which we pack... [Read more...]

As a developer on the vegan package for R, one of the most FAQs is how to customise ordination diagrams, usually to colour the sample points according to an external grouping variable. Now, just because we get asked how to do this a lot is not really a reflection on ... [Read more...]