# A small customization of ESS

May 14, 2010
By

(This article was first published on Stat Bandit » R, and kindly contributed to R-bloggers)

JD Long (at Cerebral Mastication) posted a question on Twitter about an artifact in ESS, where typing “_” gets you “<-”. This is because in the early days of S+, “_” was an allowed assignment operator, and ESS was developed in that era. Later, it was disallowed in favor of “<-” and “=”, so ESS was modified to map “_” to “<-”. Now I like the typing convenience of this map, and I don’t use underscores in my variable names, so I was fine. JD probably was using underscores in his variable names, so this was rather frustrating. There are, I discovered, three ways around this:

1. Type “_” twice, which puts in the underscore
2. Use “C-q _”, i.e. Ctrl-q then underscore
3. Put (setq ess-S-assign "_") in your .emacs file

The last fix obviously customizes ESS permanently for your emacs setup, while the first two allow you to get to underscore using the default ESS setup.

Update: Seth Falcon posted his .emacs on Twitter, which allows C-= to map the assignment operator, and leaves _ alone

 (setq ess-S-assign-key (kbd "C-=")) (ess-toggle-S-assign-key t) ; enable above key definition ;; leave my underscore key alone! (ess-toggle-underscore nil) 

Nice, Seth!!

FYI, ESS is Emacs Speaks Statistics, an emacs addon developed by Tony Rossini and others to enable intelligent editing of statistical scripts in S+, R, SAS and Stata, as well as scripts for the Gibbs Sampling programs BUGS and JAGS, and can be found here

To leave a comment for the author, please follow the link and comment on his blog: Stat Bandit » R.

R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...

If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...

Tags: , , ,

Comments are closed.