LondonR, 7 September 2011

September 11, 2011 | 0 Comments

On 7 September 2011 I attended the London R user group meeting. It was a very good turn out with about 50 attendees at the Shooting Star, a pub close to Liverpool Street Station. The session started at 18:00 with four presentations, followed by drinks ...
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A lightweight object browser for R

January 15, 2011 | 0 Comments

Get access to a simple object browser in R so that you can see what variables, data frames, model objects and other junk you have in memory currently. If you don't want to install a full-fledged integrated development environment, this option may be fo... [Read more...]

formatR update (0.1-5)

December 3, 2010 | 0 Comments

he formatR package has been silent for quite a few months now. Recently I’ve been moving my old packages from R-Forge to GitHub, and I finally killed several things on my TODO list. In the past, I made an awkward decision to let formatR depend on the animation package, ... [Read more...]

Creating GUIs in R with gWidgets

October 6, 2010 | 0 Comments

The gWidgets framework is a way of creating graphical user interfaces in a toolkit independent way. That means that you can choose between tcl/tk, Gtk, Java or Qt underneath the bonnet. There's also a web-version based upon RApache and ExtJS. Since the code is the same in each case, ...
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A Slider to Control Two Plotting Windows

September 28, 2010 | 0 Comments

One of my readers asked two weeks ago how to control two graphics windows with the slider in gWidgets. Here is a simple example: if (!require("gWidgetsRGtk2")) install.packages("gWidgetsRGtk2") library(gWidgetsRGtk2) options(guiToolkit = "RGtk2") x11() x11() dev.set() gslider(from = 1, to = 100, value = 10,     container = gwindow("Two Plotting Windows"), ... [Read more...]

alphahull: an R Package for Alpha-Convex Hull

April 16, 2010 | 0 Comments

new paper on the α-convex hull appeared in the Journal of Statistical Software today ( The α-convex hull is an interesting problem which caught my attention long time ago but I didn’t know a solution then. R has a function chull() which can ...
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formatR: farewell to ugly R code

April 13, 2010 | 0 Comments

It is not uncommon to see messy R code which is almost not human-readable like this: # rotation of the word "Animation" # in a loop; change the angle and color # step by step for (i in 1:360) { # redraw the plot again and again plot(1,ann=FALSE,type="n",axes=FALSE) # rotate; use ...
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Demonstrating the Power of F Test with gWidgets

April 2, 2010 | 0 Comments

e know the real distribution of the F statistic in linear models — it is a non-central F distribution. Under H0, we have a central F distribution. Given 1 – α, we can compute the probability of (correctly) rejecting H0. I created a simple demo to illustrate how the power changes as other parameters ... [Read more...]

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