How does one apply a monadic verb repetitively to every nth element of a one1-dimentional array?
For example: ]a=.i.20 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 n=.3 NB. Design u to increment every nth integer in a: u=.??:<?? n u a 1 1 2 4 4 5 7 7 8 10 10 11 13 13 14 16 16 17 19 19 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
