Thanks for those examples Roger + the original question Alex. Forks, obverse, and the Iversonian idea of open, operate, close are holding together a bit more strongly for me now.
sin=:1&o. cos=:2&o. tan=:3&o. f=:* a=:1 2 3 b=:4 5 6 a >@(f&.>/)@(sin;cos;tan) b 0.57275 0.919536 0.078073 _1.24397 0.191416 0.0473628 0.51559 0.104062 0.0706409 -Steven ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
