Re: All componens different
- To: mathgroup at smc.vnet.net
- Subject: [mg112016] Re: All componens different
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Tue, 24 Aug 2010 06:15:53 -0400 (EDT)
d[v_] := Length[v] == Length[Union[v]]
d /@ {{1, 2, 3}, {1, 2, 1}}
{True,False}
Bob Hanlon
---- "Dr. Wolfgang Hintze" <weh at snafu.de> wrote:
=============
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