Rick, I see a couple errors in my code ... you will need to attach the MASS package for the eqscplot() function and that function's first arguments should be any coordinates, I use (1, 1)
library(jpeg) library(MASS) # download image from internet for use in example # http://www.tootsie.com/wallpaper/wp_concord2_1344x1008.jpg img <- readJPEG("c:/temp/wp_concord2_1344x1008.jpg") # define location of two yellow gumballs, could use locator() to get these coordinates px.x <- c(172, 576) px.y <- c(433, 657) # set up plot par(xaxs="i", yaxs="i") eqscplot(1, 1, type="n", xlim=c(0, 1334), ylim=c(0, 1008)) # add image rasterImage(img, 0, 0, 1334, 1008) # add line connecting two yellow gumballs lines(px.x, px.y, lwd=5, col="yellow") Jean On Mon, Oct 28, 2013 at 4:12 AM, Rick Turner <ricktur...@btconnect.com>wrote: > I forgot to mention that I get an error from your code - the 'lines()' > command fails with the error 'object px.x not found'. I am not sure why > (yet) but need to dig into it... sigh. > > Rick > > [[alternative HTML version deleted]] ______________________________________________ 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.
