[R] Help with saptial analysis (cluster)

[ONKELINX, Thierry]

Dear Fransico,

The distance matrix would be 102000 x 102000. So it would contain 10404000000 values. If you need one bit for each value, this would requier 9,7 GB. So the distance matrix won't fit in the RAM of your computer.

Cheers,

Thierry

----------------------------------------------------------------------------
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Reseach Institute for Nature and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be
www.inbo.be 

Do not put your faith in what statistics say until you have carefully considered what they do not say.  ~William W. Watt
A statistical analysis, properly conducted, is a delicate dissection of uncertainties, a surgery of suppositions. ~M.J.Moroney

 

> -----Oorspronkelijk bericht-----
> Van: r-help-bounces op stat.math.ethz.ch 
> [mailto:r-help-bounces op stat.math.ethz.ch] Namens Francisco Pastor
> Verzonden: woensdag 25 april 2007 12:34
> Aan: r-help op stat.math.ethz.ch
> Onderwerp: [R] Help with saptial analysis (cluster)
> 
> Hi R-users
> 
> I'm a beginner with R and statistics, so I need some help to 
> start my data analysis. I've been reading some docs and 
> tutorials on R and cluster analysis.
> I've got a large dataset (102000 points) with values of 
> longitude, latitude and temperature and want to see if I can 
> find groups (clusters).
> 
> Following some tutorials I can look for principal components 
> but get an error with calculation of distances:
> 
> > matriz.distancias<-dist(comp.obs)
> Error in vector("double", length) : specified vector size is 
> too big (translated from spanish)
> 
> So, my questions are: is the dataset too big? could you point 
> me to any docs explaining how to study spatially distributed 
> data (lon,lat,data)?
> 
> Thanks in advance
> 
> 
> ______________________________________________________________
> _____________________________________
> Francisco Pastor
> Meteorology department
> Fundación CEAM
> paco op ceam.es
> http://www.gva.es/ceamet
> http://www.gva.es/ceam
> Paterna, Valencia, Spain
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