Euclidean Distance in R
Dear Paul,
The command
RSiteSearch("nearest neighbour")
Will give you the answer that you need. (The second hit is the function you want).
Best regards,
Thierry
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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.Onkelinx at inbo.be
www.inbo.be
To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of.
~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data.
~ Roger Brinner
The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey
-----Oorspronkelijk bericht----- Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] Namens Paul Duckett Verzonden: dinsdag 5 april 2011 3:44 Aan: R-help at r-project.org Onderwerp: [R] Euclidean Distance in R Hi 1. I have two raster files *.asc (identical size) 2. The data in each contain presence or absence data in each cell represented by a 1 or 0 respectively 3. I would like to take the location of each 1 (presence cell) in raster file 1 and measure the euclidean distance to the nearest 1 (presence cell) in raster file 2. Obviously in some cases there will be overlap so the distance will be zero. 4. I would like the output file to have each individual measurement on a seperate line in a single file. I am very new to R, so any help would be appreciated. Best regards Paul -- Paul Duckett - PhD Candidate Conservation Genetics Lab E8A 264 Biological Sciences Faculty of Science Macquarie University North Ryde NSW 2109 http://paulduckett.redbubble.com
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