How do you easily get beautiful calendar heatmaps of time series in ggplot2? E.g:From MarginTaleI was impressed by the lattice-based implementation from Paul Bleicher of Humedica, which you can find referenced in http://blog.revolutionanalytics.c...

In this article, Hans Gilde exposes the clever use of a heatmap hidden in the Bioconductor library. In his example, he describes a way to show different ‘observations’ on subjects, with the concept of time. Financial indices, like the S&P 500 or the Dow Jones indices, are mathematically some kind of measure of overall market

If you want more info about clustering, I have another post about "Clustering analysis and its implementation in R". Here is the link: http://onetipperday.blogspot.com/2012/04/clustering-analysis-2.html------------Several R functions in this...

I wrote before about using heatmap tables to combine the strengths of tables and graphics for nominal data. Here is a neat approach using Sweave and latex to produce an effect like in the picture. This latex code is self-contained. Just save it as myfile.Rnw, run Sweave(myfile.Rnw) from inside R and then pdflatex myfile.tex

A while back, while reading chapter 4 of Using R for Introductory Statistics, I fooled around with the mtcars dataset giving mechanical and performance properties of cars from the early 70's. Let's plot this data as a hierarchically clustered heatmap. # scale data to mean=0, sd=1 and convert to matrix mtscaled <- as.matrix(scale(mtcars)) # create...