Re: [R] how to find near neighbors?

2010-11-19 Thread Hans W Borchers
Czerminski, Ryszard  astrazeneca.com> writes:

> 
> I am looking for an efficient way to find near neighbors...
> 
> More specifically...
> I have two sets of points: A & B and I want to find
> points in set B which are closer to set A than some
> cutoff (or n-closest)
> 
> I will appreciate very much any pointers...
> 
> Ryszard
> 

'nn' in the RANN package represents a good solution for this task as it 
implements a very fast algorithm and provides the ability to search for 
nearest neighbors only within a certain radius.

Hans Werner

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Re: [R] how to find near neighbors?

2010-11-18 Thread ONKELINX, Thierry
Have a look at nncross() from the spatstat package.

Best regards,

Thierry



ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie & Kwaliteitszorg
Gaverstraat 4
9500 Geraardsbergen
Belgium

Research Institute for Nature and Forest
team Biometrics & Quality Assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium

tel. + 32 54/436 185
thierry.onkel...@inbo.be
www.inbo.be

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> -Oorspronkelijk bericht-
> Van: r-help-boun...@r-project.org 
> [mailto:r-help-boun...@r-project.org] Namens Czerminski, Ryszard
> Verzonden: donderdag 18 november 2010 17:10
> Aan: r-help@r-project.org
> Onderwerp: [R] how to find near neighbors?
> 
> I am looking for an efficient way to find near neighbors...
> 
> More specifically...
> I have two sets of points: A & B and I want to find points in 
> set B which are closer to set A than some cutoff (or n-closest)
> 
> I will appreciate very much any pointers...
> 
> Ryszard
> 
> --
> 
> Confidentiality Notice: This message is private and may 
> ...{{dropped:11}}
> 
> __
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 

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[R] how to find near neighbors?

2010-11-18 Thread Czerminski, Ryszard
I am looking for an efficient way to find near neighbors...

More specifically...
I have two sets of points: A & B and I want to find
points in set B which are closer to set A than some
cutoff (or n-closest)

I will appreciate very much any pointers...

Ryszard

--
Confidentiality Notice: This message is private and may ...{{dropped:11}}

__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.