Dear R gurus and users, I seem to have problem finding the right tool for plotting convex hulls over 2D plots, after a cluster analysis. In fact I would like to draw a convex hull in 2D for a generic group of points. I found a "convhulln", but this doesn't seem to give me a convex hull. Here is what I do:
> library(mvtnorm) > Mean <- c(2,1) > Sigma <- matrix(c(1,0,0,1),ncol=2) > Y <- rmvnorm(n=100,mean=Mean,sigma=Sigma) > hull <- convhulln(Y) > hull [,1] [,2] [1,] 16 26 [2,] 16 4 [3,] 87 47 [4,] 87 4 [5,] 21 26 [6,] 21 94 [7,] 54 47 [8,] 54 75 [9,] 23 94 [10,] 23 75 I was expecting hull to give me a few 2D points that would enclose the 100 random points generated, but this doen't seem to be the case. Probably I'm using the wrong tool here. Any help with this would be greatly appreciated. Thank you. J Dr James Foadi PhD Membrane Protein Laboratory (MPL) Diamond Light Source Ltd Diamond House Harewell Science and Innovation Campus Chilton, Didcot Oxfordshire OX11 0DE Email : james.fo...@diamond.ac.uk Alt Email: j.fo...@imperial.ac.uk -- This e-mail and any attachments may contain confidential...{{dropped:8}} ______________________________________________ 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.