returning quartiles of a list?

process[(n/2):n]

[1] 4 1 4 1

(this double counts the first 4, of course)

process[((n/2)+1):n]

[1] 1 4 1

(but this works for even lists)

process[(n/4):(n/2)]

[1] 5 7

(works)

process <- c( 5 , 7 , 4 , 1 , 4 , 1, 8)

(and this is now an odd list)

process[1:(n/2)]

[1] 5 7 4

(works fine)

process[((n/2)+1):n]

[1] 1 4 1

(but the bit that worked for the even lists above doesn't work here
(and I don't quite understand why not...)

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

	-thomas


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