Order is irrelevant in sets 1 2 3 4 ([ , -.) 3 4 5 6 1 2 3 4 1 2 1 2 3 4 ([ -. -.) 3 4 5 6 3 4
> From: Kip Murray <[email protected]> > > Good, and there is at least one other nice way to do it. > > Matthew Brand wrote: > > u =. ~.@, > > n =. ~.@(e.#[) > > 1 2 3 4 u 3 4 5 6 > > 1 2 3 4 5 6 > > 1 2 3 4 n 3 4 5 6 > > 3 4 > > > > > > > > 2009/7/16 Kip Murray : > >> The following is easy but interesting. > >> > >> A "set" is a numeric vector without repetitions. Provide definitions for > >> the > >> union u and intersection n of two sets: > >> > >> 1 2 3 4 u 3 4 5 6 NB. elements of one or the other > >> 1 2 3 4 5 6 > >> > >> 1 2 3 4 n 3 4 5 6 NB. common elements > >> 3 4 > >> ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
