As noted here there is a new paper linking Forbush events with changes in DTR. Simply, during a Forbush event  cosmic rays are modulated ( the flux reaching the earth decreases. The theory goes something like this. If GCRs play a role in cloud formation, then when they decrease you should ... [Read more...]

A bug-fix release RQuantLib 0.3.8 is now on CRAN and in Debian. RQuantLib combines (some of) the quantitative analytics of QuantLib with the R statistical computing environment and language. Thanks to Helmut Heiming who noticed a side-effec t f... [Read more...]

In a previous post (a long time ago) I discussed a way to get a R data frame into a Word table. The code in that entry was essentially a brute force way of wrapping R data in RTF code, but that RTF code was the bare minimum. There was ... [Read more...]

     Adding color to a plot is helpful in many situations for visualizing an additional dimension of the data. Again, I wrote the below function "val2col" in R after having coded this manually over and over in the past. It uses similar arguments as the image function in that one ... [Read more...]

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Sometimes it is convenient to use “call by reference evaluation” inside an R function. For example, if you want to have multiple return value for your function, then either you return a list of return value and split them afterward or you can return the value via the argument. For ... [Read more...]

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I have recently used the subplot() function of the TeachingDemos library for R: I wanted to create a simple embedded chart with multiple lines on it. The trick was to create a simple function that prepares the whole plot and pass it to the subplot() function to execute as shown ... [Read more...]

Recently, while typing up an R tutorial, I used the LaTeX fancyvrb package to create two environments—one coloured blue for R commands, and one coloured red to display R output. This worked well for large blocks of each type. Then I decided I wan... [Read more...]

I enjoy trying difference kind of R packages. Since I have more than 1 computers (1 at home, 1 at office and a laptop) it is troublesome to check whether I have installed some new packages for each computer. Therefore i wrote a function to load and install packages at once. If the ... [Read more...]

One of the most straightforward examples of how we use Bayes to update our beliefs as we acquire more information can be seen with a simple Bernoulli process. That is, a process which has only two  possible outcomes. Probably the most commonly thought of example is that of a coin ... [Read more...]

As a first step to produce some useable code for spline interpolation/approximation in R, I set out to first do polynomial interpolation to see how I get along. It's not that there is no spline interpolation software for R, but I find it a bit limited. splinefun, for example, ... [Read more...]

I am very intrigued by the Infochimps Geo API, so wanted to play around with it a little bit and pull the data into R. I’ll start by getting data from the American Community Survey Topline API for a 10km area around where I live. First some setup code ... [Read more...]

I have an article out this week on ReadWriteHack: Unlocking Big Data with R. My thanks to the folks at ReadWriteWeb for giving us the opportunity to showcase some of the many real-world Big Data applications of R. Here are some additional links about the applications mentioned in the article: ... [Read more...]

The most recent edition of the Revolution Newsletter is out. The news section is below, and you read the full September edition (with highlights from this blog and community events) online. You can subscribe to the Revolution Newsletter to get it monthly via email. Using Revolution R with Hadoop: Revolution ... [Read more...]

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We are a global management consulting firm and are looking for data scientists in our team in New York/Washington DC and Gurgaon/Chennai (India). There are full-time and internship (New York) opportunities. There are multiple positions i... [Read more...]

The weekend puzzle in Le Monde this week is again about a clock.  Now, the clock has one hand and x ticks where a lamp is either on or off. The hand moves from tick to tick and each time the lights go on or off depending on whether or ... [Read more...]

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