[R] A kind of set operation in R

[Dirk Eddelbuettel]

Julio,

Nobody mentioned the _set_ operations union(), intersect(), setdiff(),
which are described under 'help(union)' (and the other names, of course)

  R> X <- c(10:13, 17,18)
  R> Y <- c(11,12,17,18)
  R> intersect(X, Y)		# gives the actual values
  [1] 11 12 17 18
  R> X %in% intersect(X, Y)	# use %in% to map to bool as desired
  [1] FALSE  TRUE  TRUE FALSE  TRUE  TRUE
  R> 

Oh, and no need to reply on-list to thousands of list subscribers if you
found this helpful.  These one-line 'thanks' message are not that universally
useful, even though they are very polite :)

Dirk

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