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MathGroup Archive 2005

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Re: calculate de Jong function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57008] Re: [mg56969] calculate de Jong function
  • From: "Christoph Lhotka" <lhotka at astro.univie.ac.at>
  • Date: Thu, 12 May 2005 02:33:13 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi!

f[x_List] := Sum[x[[i]]^2, {i, 1, Length[x]}]

or

f[x_List] := Plus@@x^2

since Powers are Listable

with kind regards


On Wed, 11 May 2005 05:24:54 -0400 (EDT)
 Stefan Schuster <bi1169*delete_from_star_to_star* at fh-weihenstephan.de> wrote:
> Hello,
> 
> I don't know how I should implement the first de jong function:
> 
> f(x)=Sum((x_i)^2)
> where x is a Vector with n dimensions and x_i is the value of the i-th 
> Dimension.
> i.e. all Values of the Vector are squared and added.
> 
> My problem is that I don't know how many Dimensions there are, so I 
> can't define the borders of the SUM function.
> 
> thanks in advance for help
> 
> Stefan
> 


-- Christoph Lhotka --
University of Vienna
Institute for Astronomy


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