I think that the question has to be answered, "It depends on the data that is being copied."
Consider: ;3#<1 2 3 which gives the answer you want for the data you have. It boxes the data, internally creates a set of three boxes and then razes the data out of them. But you might want to deal with a large amount of data of mixed type which is previously boxed. It also works as ;3$<1 2 3 Consider: >3$<(< 1 2 ), <'x' or ,>3$<(< 1 2 ), <'x' To help you understand this, try 3$<(< 1 2 ), <'x' Again, 3#<(< 1 2 ), <'x' also works. On Fri, Dec 30, 2011 at 1:42 PM, Johann Hibschman <jhibsch...@gmail.com>wrote: > Continuing my J 101 questions, what's the best way to do a cyclical > (as opposed to element-wise) copy? > > (2#1 2) gives (1 1 2 2), I want (1 2 1 2). The best I've come up with > is (,2#,:1 2). Is there a better way, or is that it? > > Cheers, > Johann > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Of course I can ride in the carpool lane, officer. Jesus is my constant companion. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
