2692 search results for "twitter"

Rescuing Twapperkeeper Archives Before They Vanish

December 10, 2011
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Rescuing Twapperkeeper Archives Before They Vanish

A couple of years or so ago, various JISC folk picked up on the idea that there might be value in them thar tweets and started encouraging the use of Twapperkeeper for archiving hashtagged tweets around events, supporting the development of that service in exchange for an open source version of the code. Since then,

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Using R to create a logo: Simple

December 9, 2011
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Using R to create a logo: Simple

R user Josh Reich, who we've featured here on the blog before, is also the CEO and co-founder of the new user-friendly bank, Simple. (Confidential to Josh -- still waiting on my invite...). So it's no suprise that Simple's logo is rendered using the R language: wave <- function (a, R, p, w) { x <- (0.5 + 0.5*R*sin(p+w*a))*cos(a)...

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In case you missed it: November roundup

December 9, 2011
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In case you missed them, here are some articles from November of particular interest to R users. R 2.14 now includes SVG support for Windows. The submissions for the Applications of R in Business contest are available for viewing online. A tutorial on using the Rdatamarket package to import public datasets into R. Free books on R for multivariate...

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Running your R and LaTeX Infrastructure from a portable USB Drive

December 9, 2011
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Running your R and LaTeX Infrastructure from a portable USB Drive

On my road to eventually running all of my programs off an USB device I’ve gotten a little bit closer yesterday thanks to input from Duncan Murdoch and Yihui Xie. Eventually running the entire Windows OS off a USB drive would be nice (not talking about running it as a Virtual Machine, but to have … Continue reading...

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Simple and Profitable

December 8, 2011
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Simple and Profitable

The end of the month effect was examined by MarketSci in the The Last Day of the Month Blahs post. The idea is simple: buy on the last day of the month and sell a few days later. This idea was put into a strategy by Quanting Dutchman in the Strategy 2 – Monthly End-of-the-Month

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Le Monde puzzle [#752]

December 8, 2011
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Le Monde puzzle [#752]

After a loooong break, here is one Le Monde mathematical puzzle I had time to look at, prior to going to Dauphine for a Saturday morning class (in replacement of my R class this week)! The question is as follows: A set of numbers {1,…,N} is such that multiples of 4 are tagged C and

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Code Optimization: One R Problem, Thirteen Solutions – Now Sixteen!

December 8, 2011
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Code Optimization: One R Problem, Thirteen Solutions – Now Sixteen!

Introduction The old r-wiki optimisation challenge describes a string generation problem which I have bloged about previously both here and here. The Objective To code the most efficient algorithm, using R, to produce a sequence of strings based on a single integer input, e.g.: Solutions One Through Thirteen A variety of different approaches are illustrated on the

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Statistics with R – Lots of R Examples

December 8, 2011
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Statistics with R – Lots of R Examples

“Statistics with R” is a great R graphics & stats website. It provides lots of R examples, covering many analytics topics. It is also available as a PDF document to download at the website, as well as the R codes. … Continue reading →

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Plotting BeijingAir Data

December 7, 2011
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Plotting BeijingAir Data

Here’s a bit of R code for scraping the BejingAir Twitter feed and plotting the hourly PM2.5 values for the past 24 hours. The script defaults to the past 24 hours but you can modify that by simply changing the value for the variable ‘n’.  You c...

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Judging panel for Applications of R in Business contest

December 6, 2011
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Now that the final submissions are in for the Applications of R in Business contest, it's time to announce the judging panel who will select the winners for $20,000 in cash prizes from Revolution Analytics. They are: Edd Dumbill, technologist and writer for O'Reilly Media David Menninger, VP & Research Director at Ventana Research Steve Miller, technology writer and...

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