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An R tip:
Did you know that x[[c(5,3)]] is the same as x[[5]][[3]]?
I should make more thorough use of this.
In the help file for [[:
[[can be applied recursively to lists, so that if the single indexiis a vector of lengthp,alist[[i]]is equivalent toalist[[i1]]...[[ip]]providing all but the final indexing results in a list.
I never knew this; I came across it when playing around (i.e., not paying proper attention) in the back of the room at an R course.
Did you know that [[ had a help file? Type ?"[["
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