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2010 Feb 02
0
Revolutions blog: January Roundup
I write about R every weekday at the Revolutions blog:
http://blog.revolution-computing.com
and every month I post a summary of articles from the previous month
of particular interest to readers of r-help.
http://bit.ly/a4iVi5 linked to slides and video from a 30-minute
"Introduction to R" talk I gave on January 28, with links to many
useful R resources.
http://bit.ly/cfhrO1 brought
2008 Dec 09
2
Better way to find distances between points in a set?
I was playing around a bit to see how I could find the two points in a
set of points (or ordered pairs) furthest from each other.
Here's what I did:
1) created a Nrow by 2col matrix, so each row contains an x,y coordinate
pair.
2) fed the matrix to a nested mapply (cv is my matrix):
mapply(function(k,l) mapply(function(x,y,a,b)
+