Re: All componens different
- To: mathgroup at smc.vnet.net
- Subject: [mg112017] Re: All componens different
- From: Peter Pein <petsie at dordos.net>
- Date: Tue, 24 Aug 2010 06:16:04 -0400 (EDT)
- References: <i4t5qb$g2q$1@smc.vnet.net>
Am Mon, 23 Aug 2010 06:51:55 +0000 (UTC)
schrieb "Dr. Wolfgang Hintze" <weh at snafu.de>:
> Given a list v of natural numbers I'm looking for a function d[v_]
> that returns True if all components are different and False otherwise.
>
> One solution is
>
> d1[v_] := ! Or @@ Flatten[Table[v[[i]] == v[[k]], {i, 1, Length[v]},
> {k, i + 1, Length[v]}]]
>
> Can you find more efficient (and elegant) solutions?
>
> Regards,
> Wolfgang
>
>
what about v === DeleteDuplicates[v] ?