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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.**The Praise of Insects**, and kindly contributed to R-bloggers)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)))

}

To

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