Re: nth differences
- To: mathgroup at smc.vnet.net
- Subject: [mg39869] Re: nth differences
- From: Bill Rowe <listuser at earthlink.net>
- Date: Sun, 9 Mar 2003 05:29:02 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
On 3/8/03 at 2:52 AM, _NOzturnerSPAM_ at cyberonic.com (Zachary Turner)
wrote:
>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
ListConvolve[{1,-1},{1, 2, 5, 7, 8, 9}] will compute what you are calling the first difference and
Nest[ListConvolve[{1, -1}, #] &, {1, 2, 5, 7, 8, 9}, n] will compute the nth difference