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MathGroup Archive 2004

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Re: Select from a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49900] Re: Select from a list
  • From: "Steve Luttrell" <steve_usenet at _removemefirst_luttrell.org.uk>
  • Date: Thu, 5 Aug 2004 09:22:11 -0400 (EDT)
  • References: <ceqtvt$k0n$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

This does what you want:

a={1,1,2,2,4,6,6,8,8,9};

b=Split[a]
{{1,1},{2,2},{4},{6,6},{8,8},{9}}

Map[First,b]
{1,2,4,6,8,9}

Steve Luttrell

"Feng-Yin Chang" <fychang at slac.stanford.edu> wrote in message
news:ceqtvt$k0n$1 at smc.vnet.net...
> Hi everyone,
>
>    Does anyone have an idea to drop the repeating elements in one list?
>    The list was built in sequence,fortunately.
>
>    for example,
>    from a={1,1,2,2,4,6,6,8,8,9}
>    to a1={1,2,4,6,8,9}
>
>
>   The purpose is to avoid the one-to-many mapping problem in my case.
>
> Feng-Yin Chang,
> Institute of Physics,NCTU,Taiwan
>



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