Posts Tagged ‘ gWidgetsRGtk2 ’

A Slider to Control Two Plotting Windows

September 28, 2010

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"), handler = function(h, ...) {

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formatR: farewell to ugly R code

April 13, 2010
formatR: farewell to ugly R code

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 rainbow() colors text(1,1,"Animation",srt=i,col=rainbow(360),cex=7*i/360) #

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Demonstrating the Power of F Test with gWidgets

April 2, 2010

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 vary,

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