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MathGroup Archive 2003

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Re: nth differences

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39872] Re: nth differences
  • From: atelesforos at hotmail.com (Orestis Vantzos)
  • Date: Sun, 9 Mar 2003 05:29:26 -0500 (EST)
  • References: <b4c9lo$nqg$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

diff[lst_List]:=Drop[lst,1]-Drop[lst,-1]
then Nest[diff, myList, {n}] to get the n-th difference of myList
Orestis

"Zachary Turner" <_NOzturnerSPAM_ at cyberonic.com> wrote in message news:<b4c9lo$nqg$1 at smc.vnet.net>...
> Say I have a list of k integers and I want to produce a list containing the
> first differences?  For example, given {1, 2, 5, 7, 8, 9} the first
> differences are {1, 3, 2, 1, 1}, and the second differences are {2, -1, -1,
> 0}, the third are {-3, 0, 1}, etc


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