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MathGroup Archive 2005

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Re: Distance from point to set

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55307] Re: Distance from point to set
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Sat, 19 Mar 2005 04:45:09 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <d1eblq$ek7$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

distanceToSet[pnt_, pset_] := Min[Sqrt[#.#] &[# - 
pnt] & /@ pset]

and

pointSet = Table[Random[], {10}, {2}];

pnt = {-2, 2};

distanceToSet[pnt, pointSet]

Regards

  Jens

"Piotr Kowalski" <pkowalsk at ibspan.waw.pl> schrieb 
im Newsbeitrag news:d1eblq$ek7$1 at smc.vnet.net...
> Hello,
>
> I would like to compute distance d(x,A) from a 
> point 'x' to a set 'A',
> (all in R^n, where n=2 or n=3) that is:
>
>   d(x,A) = min ||x - a|| (forall a in A)
>   where: n=2 or n=3,
>          x is point in R^n, A is subset of R^n
>          ||  || is norm (euclidean, max, etc).
>
> Can I find Mathematica function or package for 
> such problem ?
>
> Thank you in advance,
> P. Kowalski
> 



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