DOC: show users how to emulate R c function with iloc slicing and r_
Nice comparison! 
Just a remark, you didn't really give the pandas alternative for your first case (to access columns by name), so maybe add that? (`df[, c("a", "c", "e")]` -> `df[["a", "c", "e"]]`)
 @jorisvandenbossche Thanks! I'll add that.
 @jorisvandenbossche Any more comments?
 Nope, thanks! Maybe just check tomorrow the rendered dev doc to see if everything looks good
 FYI the docs builds almost immediately after it's merged

http://pandas-docs.github.io/pandas-docs-travis/
