It looks to me like the most terse way is ((</. /: ~...@[)~ f) data Although this computes the nub twice, unlike some earlier solutions.
Marshall ________________________________________ From: programming-boun...@jsoftware.com [programming-boun...@jsoftware.com] On Behalf Of Raul Miller [rauldmil...@gmail.com] Sent: Wednesday, September 22, 2010 3:29 PM To: Programming forum Subject: Re: [Jprogramming] Classification problem Note, if * is the universe of interesting functions (if it does not need to be generic) then I would be tempted to use a variation on Dan's second suggestion: (<@}./.~ *) _1 0 1,data Note that this also preserves the relative ordering of the data items. -- Raul ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
