I took some time today to configure my R experience. I’m mostly using R from Emacs using ESS (Emacs Speaks Statistics), which means I had to configure some settings there as well.

Previously, my settings only consisted of setting a customised directory in which to install my packages and an alias to start R without asking for saving the histroy when quitting. This I did by setting the following environment variable in my .bashrc and/or .zshrc, as well as an alias:

# Set the library path for R
export R_LIBS_USER=${R_LIBS_USER}:~/Programmeren/R/lib
if [ -n "$(/usr/bin/which R 2>/dev/null)" ]; then
alias R="$(/usr/bin/which R) --no-save"

However, Emacs didn’t pick up either of these variables, so high time to fix that. This meant creating two files with the following content:


# Set the default CRAN repository used by install.packages()
options("repos" = c(CRAN = "http://cran-mirror.cs.uu.nl/"))



I added the following to my .emacs file to start R with the --no-save option:

(setq inferior-R-args "--no-save ")

Additionally I have the following in there to turn on a spelling checker and have line-wraps enabled:

(add-hook 'ess-mode-hook
          (lambda ()
            ;; Set pdflatex as the default command for Sweave (default: texi2pdf)
            (setq ess-swv-pdflatex-commands (quote ("pdflatex"
            (auto-fill-mode t)