You can do this by reading in the image and plotting it, then use the updateusr function from the TeachingDemos package to set the user coordinates to match the image (use locator to find the current values of some points). Then you can just use the locator function to get the coordinates of the points.
-- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of Rob James > Sent: Friday, October 15, 2010 2:46 PM > To: r-help@r-project.org > Subject: [R] Recovering x/y coordinates from a scatterplot image > > Do I recall correctly that there is an R package that can take an > image, > and help one estimate the x/y coordinates? I can't find the package, > thought it was an R-tool, but would appreciate any leads. > > Thanks, > > Rob > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
