Ignore the boxing. (* 0>:@,~2=}.) 1 2 3 2 2 4 2 1 2 2 6 4 2 8 2 1
R.E. Boss (Add your info to http://www.jsoftware.com/jwiki/Community/Demographics ) > -----Original Message----- > From: [email protected] [mailto:programming- > [email protected]] On Behalf Of 'Pascal Jasmin' via > Programming > Sent: maandag 12 mei 2014 19:12 > To: Programming forum > Subject: [Jprogramming] ^: and boxes > > I'm looking for this answer, but a better way to do it. > > > ({~"1 0 [: i.#) (<@:+:@>)^:(1 |. 2= ] &>) ;/ 1 2 3 2 2 4 2 1 > 2 2 6 4 2 8 2 1 > > the right hand side must be boxed. Unboxing at end, just there for > display. Should not assume that it is possible for input. > > What the above is doing is if/for a cell that is equal to 2, double the previous > cell. > > To get it to work, I've had to generate a full n x n table, and then take the > diagonal. Is there a better tacit way that avoids n x n table? > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
