[adegenet-forum] Delaunay Triangulation editing

[Jombart, Thibaut]

Hello, 

I had developed a package on R-forge which handles large spatial graphs in an interactive way. You can zoom in/out, move around, add/remove edges, etc. See vignette attached. The URL of the package website is there:
https://r-forge.r-project.org/projects/geograph/

It works, but I never released it on CRAN and won't provide a lot of support for it. 

For your task, it may be total overkill though. Usually the only thing to change in Delaunay's graph are the peripheral edges connecting very distant points. If you have more than that to remove, maybe you should consider Gabriel's graph? 

Cheers
Thibaut

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Dr Thibaut JOMBART
MRC Centre for Outbreak Analysis and Modelling
Department of Infectious Disease Epidemiology
Imperial College - School of Public Health
St Mary’s Campus
Norfolk Place
London W2 1PG
United Kingdom
Tel. : 0044 (0)20 7594 3658
t.jombart at imperial.ac.uk
http://sites.google.com/site/thibautjombart/
http://adegenet.r-forge.r-project.org/
________________________________________
From: adegenet-forum-bounces at lists.r-forge.r-project.org [adegenet-forum-bounces at lists.r-forge.r-project.org] on behalf of Peter [peter.rooney at blueyonder.co.uk]
Sent: 22 December 2013 18:14
To: adegenet-forum at lists.r-forge.r-project.org
Subject: [adegenet-forum] Delaunay Triangulation editing

Dear all,

I am using adegenet sPCA for the first time, so apologies if this has been asked before, however, I couldn’t find any information from a search of the archives.

I wish to edit the Delaunay triangulation to be used in an sPCA analysis.  I have successfully created the Neighbour List object using chooseCN from my data, but the editor it invokes, “edit.cn”, is very difficult to use, displays my data very poorly (many nodes are too close on the screen image), and doesn’t appear to reference its nodes with the individual ids in my data.  Therefore, I wonder if anyone could describe another way, in R or not, that I could use to remove some of the unwanted edges in the triangulation?

Many thanks for your help.

Peter
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