Does > delaunayn(scale(coord),options="Qbb")
help? Keith J On 26/07/2012 08:26, Jean-Luc Dupouey wrote:
Dear R helpers, I try to use the 'delaunayn' function in the 'geometry' package for Delaunay triangulation in 2 dimensions. For the four following points, I get a warning message : > coord=matrix(ncol=2,byrow=TRUE,c(622633,7073452, + 621228,7073517, + 621879,7071762, + 621065,7073331)) > library(geometry) > > test=delaunayn(coord,options="Qbb") qhull precision warning: The initial hull is narrow (cosine of min. angle is 0.9999999999999999). Is the input lower dimensional (e.g., on a plane in 3-d)? Qhull may produce a wide facet. Options 'QbB' (scale to unit box) or 'Qbb' (scale last coordinate) may remove this warning. Use 'Pp' to skip this warning. See 'Limitations' in qh-impre.htm. I read carefully qh-impre.htm and I still do not understand why I get this message. A simple call to plot(coord) shows that the points are not aligned, nor very close. What did I miss? Thanking you in advance, Jean-Luc Dupouey INRA-Lorrain University Forest Ecology & Ecophysiology Unit F-54280 Champenoux France mail: dupo...@nancy.inra.fr
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