MathGroup Archive 2002

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Keeping order with Union

  • To: mathgroup at
  • Subject: [mg32590] Keeping order with Union
  • From: "Dave Snead" <dsnead6 at>
  • Date: Wed, 30 Jan 2002 03:19:12 -0500 (EST)
  • Sender: owner-wri-mathgroup at

I'd like a function that throws out duplicate entries in a list and keeps
original list order.  (when it sees 2 equal entries it throws out the one
that is later in the list).   I'd use Union, but it sometimes changes the
order of the elements in the list.  What's the tersest way to do this?
Thanks in advance,
Dave Snead

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