returning quartiles of a list?

Thomas Lumley writes:

Ah. Look at the indexing vector

((n/2)+1):n

[1] 4.5 5.5 6.5

You actually want n%/%2 or round(n/2) rather than n/2 to ensure that
it is an integer

Yep, that did it.  I can now do this kind of thing:

firsthalf <- function(v) {
  n <- length(v)
  return (v[1:(n/2)])
}

secondhalf <- function(v) {
  n <- length(v)
  return (v[((n%/%2)+1):n])
}

I'll need to write other functions for 1/3, etc., but that's fine.

thanks again!
greg
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