Re: Uniquely Subtracting Elements in a Flat List
- To: mathgroup at smc.vnet.net
- Subject: [mg29198] Re: [mg29182] Uniquely Subtracting Elements in a Flat List
- From: BobHanlon at aol.com
- Date: Sat, 2 Jun 2001 17:56:07 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
In a message dated 2001/6/2 6:03:00 AM, kd7cyb at mac.com writes:
>I need help taking a flat list, such as {a,b,c,d} and generating another
>list by successively subtracting a-b, b-c, c-d, so that the resulting
>list would be {a-b,b-c,c-d}.
>
l1 = {a,b,c,d};
Drop[l1,-1]-Rest[l1]
ListConvolve[{-1,1},l1]
Rest[RotateRight[l1]-l1]
Bob Hanlon
Chantilly, VA USA