(This article was first published on The Praise of Insects, and kindly contributed to R-bloggers)
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.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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