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Re: Select from a list

• To: mathgroup at smc.vnet.net
• Subject: [mg49880] Re: [mg49856] Select from a list
• From: "David Park" <djmp at earthlink.net>
• Date: Thu, 5 Aug 2004 09:20:47 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Just use Union.

{1, 1, 2, 2, 4, 6, 6, 8, 8, 9} // Union
{1, 2, 4, 6, 8, 9}

If your elements are not in sorted order and you want to keep them in the
same order, then look at the UnsortedUnion example in the Union Help
Examples.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/

From: Feng-Yin Chang [mailto:fychang at slac.stanford.edu]
To: mathgroup 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