Re: Need pure function to opeate on integer lists
- To: mathgroup at smc.vnet.net
- Subject: [mg68135] Re: Need pure function to opeate on integer lists
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Tue, 25 Jul 2006 04:01:37 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 7/24/06 at 12:55 AM, tharter at attglobal.net (Terry) wrote:
>Suppose I have a list of integers, such as
>listA = {1,2,5,6,7,12,13,15,16,17,18,22,23,24}
>how do I construct a pure function that will difference successive
>integer elements to produce
>{1-24,2-1,5-2,6-5,7-6,12-7,13-12,15-13,16-15,17-16,18-17,22-18,23-22
>,24-23}
ListConvolve will do what you need. That is
In[4]:=
ListConvolve[{1,-1},listA,{1,1}]
Out[4]=
{-23,1,3,1,1,5,1,2,1,1,1,4,1,1}
and to make it a pure function use
ListConvolve[{1,-1},#,{1,1}]&
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