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MathGroup Archive 2003

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Re: simple vactor magitude question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43785] Re: simple vactor magitude question
  • From: "Mark Westwood [EPCC]" <markw at epcc.ed.ac.uk>
  • Date: Sat, 4 Oct 2003 02:05:03 -0400 (EDT)
  • Organization: Edinburgh University
  • References: <blj5e0$1dv$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Nathan,

If you have stored p as a list, that is a sequence of values enclosed by 
{ and }, then the correct syntax for selecting the i-th value is p[[i]] 
- with doubled square brackets.

Regards
Mark Westwood

Nathan Moore 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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