Those of you following my occasional updates here know that I have previously posted code for graphing Twitter friend/follower networks using R (post #1. post #2). Kai Heinrich was kind enough to send me some updated code for doing so using a newer version of the extremely useful twitteR package. His ... [Read more...]

After recently discovering the excellent methods section on mappingonlinepublics.net, I decided it was time to document my own approach to Twitter data. I’ve been messing around with R and igraph for a while, but it wasn’t until I discovered Gephi that things really moved forward. R/igraph ... [Read more...]

I’ve plotted several word association graphs for this New York Times article (1st paragraph) using R and the igraph library. #1, random method #2, circle method #3, sphere method #4, spring method #5, fruchterman-reingold method # 6, kamada-kawai method #7, graphopt method The red vertices mark cliques. Here’s the (rough) R code for plotting such [...] [Read more...]

Edit: And here is an update of the update, this one contributed by Kai Heinrich. Here’s an updated version of my script from last month, something I’ve been meaning to do for a while. I thank Anatol Stefanowitsch and Gábor Csárdi for improving my quite sloppy ... [Read more...]

Edit: I’ve posted an updated version of the script here. It is not quite as compressed as Anatol’s version, but I think it’s a decent compromise between readability and efficiency. Edit #2 And yet another update, this one contributed by Kai Heinrich. I hacked together some code for ... [Read more...]

R Lesson 2 text gsub ("second", "third", text) SEARCH-REPLACE-SUBJECT [1] "This is a first example sentence." [2] "And this is a third example sentence." __ gsub ("n", "X", text) [1] "This is a first example seXteXce." [2] "AXd this is a secoXd example seXteXce." __ gsub ("is", "was", text) [1] "Thwas was a first example [...] [Read more...]

(This post documents the first day of a class on R that I took at ESU C&T. I is posted here purely for my own use.) R Lesson 1 __ 2+3; 2/3; 2^3 [1] 5 [1] 0.6666667 [1] 8 --- Fundamentals - Functions __ log(x=1000, base=10) [1] 3 --- (Formals describes the syntax of other [...] [Read more...]