Re: Uniquely Subtracting Elements in a Flat List
- To: mathgroup at smc.vnet.net
- Subject: [mg29196] Re: Uniquely Subtracting Elements in a Flat List
- From: bghiggins at ucdavis.edu (Brian Higgins)
- Date: Sat, 2 Jun 2001 17:56:06 -0400 (EDT)
- References: <9fad6s$j7b$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Alan, Try this:
mylist = {a, b, c, d}
In[57]:=Drop[mylist - RotateLeft[mylist], -1]
Out[57]={a - b, b - c, c - d}
Cheers,
Brian
Alan <kd7cyb at mac.com> wrote in message news:<9fad6s$j7b$1 at smc.vnet.net>...
> 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}.
>
> Thanks,
> Alan