Hi Don, I think that copy (#) combined with increment (>:) may be able to do the trick.
1 1 0 0 1#i.5 NB.index 0 0 1 4 1 1 0 0 1>:@#i.5 NB.index 1 1 2 5 Although reading through your journey to get to this point I wonder if Nub (~.) would do the trick. arr ab cd yyy jcd ab cd yyy jcd ab cd +./"1 'cd' E."1 arr 0 1 0 1 0 1 0 1 0 1 ( i.#arr) * +./"1 'cd' E."1 arr 0 1 0 3 0 5 0 7 0 9 ~. ( i.#arr) * +./"1 'cd' E."1 arr 0 1 3 5 7 9 Cheers, bob On Aug 30, 2014, at 4:30 PM, Don Kelly <d...@shaw.ca> wrote: > 1 1 0 0 1/⍳5 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
