For very low range numbers (less than 10), this could work The problem with this approach is that it generates all permutations !n
(~.@(] /:"1 ])@(2]\])@;@(i.@!@# A. ]) i.) 4 On Fri, Dec 18, 2015 at 7:58 AM, 'Jon Hough' via Programming <[email protected]> wrote: > I've spent an hour on this, and am frustrated that I couldn't figure out a > way to do it (without using for_j or while). > > I want to get all pairs ( pair order not important e.g. 2 3 is the same as 3 > 2) of integers up to some value. > > e.g. up to 4: > > 0 1 > 0 2 > 0 3 > 1 2 > 1 3 > 2 3 > > in frustration this is what I came up with (for the case of 10): > /:~ ~. /:~"1 (1000 # 2) ? 10 > > which works but is not a very good solution. > > Any nice solutions? > > Thanks, > > Jon > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
