Re: simple vactor magitude question
- To: mathgroup at smc.vnet.net
- Subject: [mg43784] Re: simple vactor magitude question
- From: "Tom R." <ZZNHTFKGIAIT at spammotel.com>
- Date: Sat, 4 Oct 2003 02:05:02 -0400 (EDT)
- References: <blj5e0$1dv$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
This should do it: Apply[Plus, Table[p[[i]] i, {i, 0, Length[p] - 1}]]
Maybe someone has a more elegant solution...
Tom
On Fri, 3 Oct 2003 06:36:48 +0000 (UTC), Nathan Moore
<nmoore at physics.umn.edu> wrote:
>Suppose I generate a 1-d vecctor of "N" numbers, p[i], and now I want to
>find the sum of (the vector element * index). I think the syntax should look
>something like,
>
>Sum[p[i]*i,{i,0,N}]
>
>but this doesn't seem to be the correct syntax - any help would be
>appreciated.
>
>Nathan Moore,
>University of Minnesota Physics