OK, this won't impress any old hands, but I loved the way this turned out so easy! A matrix of rotation for a point on a 2-d plane:
rotation =: [: > (cos;-&sin),:sin;cos rotate =: (mx~ rotation)~ NB. φ rotate x y Hm, looking at it now, I could have the unbox in the rotate function rather than the rotation matrix, I'l go try that now. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
