As far as I can tell u/ y <=> foldr1 u y (in Haskell).
-/ i.4 => -2 foldr1 (-) [0..3] => -2 I can also do foldl1 as u~/ What I don't understand is the speed difference(huge) between ,/ i.1000000 and ,~/ i.1000000 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
