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