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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] ?


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