Perhaps not a typo, but an early version. Long ago the rank of *: etc was infinite. If the code is ancient, it would have been broken by the change in rank.
Henry Rich Sherlock, Ric wrote: >> From: Nicholas Spies >> >> On page 18. Geometry of the J Dictionary, of the online documentation >> that came with J, the example definition >> >> (length=: +/&.*:) 5 12 >> >> yields 5 12 instead of the displayed 13 > > Yes I agree that this is a typo in the Dictionary. > As Kip points out &. should be &.: > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
