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The following R function returns the distance between two points located on a plot. The distance returned is in the same units as that of the plot.Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.
interDist < - function(x){
aa < - locator(2)
dx < - aa$x[2] - aa$x[1]
dy < - aa$y[2] - aa$y[1]
sqrt(sum(c(dx^2, dy^2)))
}
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