There are many in my memory (but sometimes not as clear as they once were) having started being wowed by them more than 50 years ago.... One that I proudly remember was a response from The Hui that he was wowed by my response to a forum question asking how to calculate the distance from origin of coordinates to a set of xy points -
I suggested keeping the xy pairs in a 2 by n table - e.g. ] xy=. _10 + ? 2 10$50 8 25 27 27 2 24 22 8 12 24 23 26 _4 14 _1 19 29 35 39 12 j./xy 8j23 25j26 27j_4 27j14 2j_1 24j19 22j29 8j35 12j39 24j12 NB. and to calculate the desired distances - | j./xy 24.35159132 36.06937759 27.29468813 30.41381265 2.236067977 30.61045573 36.40054945 35.90264614 40.80441153 26.83281573 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
