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MathGroup Archive 2003

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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


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