Thankyou. It is a very subtle use of &. and #
verb &. (boolean &. #) values David > Don Guinn donguinn at gmail.com > Sun Sep 19 23:21:12 HKT 2010 </snip> > I did this to restrict the erase to the current locale: myerase=: 3 : 0 x=. (y=. ;:^:(L.=0:)y)e.4!:1]i.4 4!:55&.(x&#)y ) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm