(The "r" in my display name has nothing to do with the R programming language, though it seems convenient.)

Preferred tools: emacs/ess, knitr, LaTeX, linux
Preferred languages: R, python, GAMS/CPLEX
Interests: optimization, datavis, network analysis, security, robotics

Popular answers (for good or bad ...)

These are mostly for my reference, saves searching again and again ...

• reproducible questions
• apply versus loops
• list of dataframes
• more about the various *apply functions
• R on Windows with spaces in paths (a weak argument for custom installation directory such as C:/R/)
• require vs library