W.Ch Lin wrote: > Does J have filter function like clojure's ? > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm
I definitely want to hear what the J crowd says, but just to be sure, in Clojure you could say (filter #(zero? (rem % 2)) (range 1 11)) > 2 4 6 8 10 To pull out the even numbers. So filter takes a predicate and a collection basically. I was thinking in J I'd to something like ,.((|~ & 2) 1 + i. 10) ;, 1 + i.10 +--------------------+ |1 0 1 0 1 0 1 0 1 0 | +--------------------+ |1 2 3 4 5 6 7 8 9 10| +--------------------+ Where as you can see all even values get a 0 return from (|~ & 2), but that leaves 2 questions 1) Is that how you would do it with J at all? 2) Disregarding 1, how would you pick those 0 values out from the original list 1 + i.10 ? Thanks Lau ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
