On Tue, Aug 2, 2011 at 2:53 AM, mijj <[email protected]> wrote: > [(2 _2) +&.> (6&*)&.> 1 2; 1 2 3] worked .. but i wanted to combined > it into one expression. > > - for me at the moment, getting an understanding of J is more important > than a bare result. (And i didn't like the exra box op.)
To understand how the expression I wrote work, I would recommend http://www.jsoftware.com/help/dictionary/samp14.htm > another prob i'm having, which ought to be simple is: > creating a concatenated list from boxed lists: > > i.e. > Jmagic 1 2;3 4 5 > NB. -> 1 2 3 4 5 For this, I recommend http://www.jsoftware.com/help/dictionary/d330.htm > but i feel i ought to be able to do this as some sort of variant of > f&:> 1 2; 1 2 3 > where [f] involves some [,] activity. That will not work -- the individual boxes already contain lists. You could use (,]&:> 1 2;1 2 3) -. 0 But that approach requires that you know your list does not contain any zeros. And ;1 2;1 2 3 is so much simpler. Anyways, perhaps you could start with http://www.jsoftware.com/help/dictionary/intro.htm and then follow the >> links in the top right corner for a while. That should give you an overview, and help get you started on the general issues of finding the parts of the language you need. -- Raul ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
