Interactive function for distances in plots

March 11, 2012

(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)))

To leave a comment for the author, please follow the link and comment on his blog: The Praise of Insects. offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...

If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...

Comments are closed.