On Wed, Oct 6, 2010 at 1:45 AM, Josh B <josh...@yahoo.com> wrote: > Hi all, > > I am trying to do something simple, but which is deviling me. I want to add an > up-arrow to the x-axis, pointing to a specific location on the axis. I want > the > arrow to be as large as possible. > > Here is where I'm at with my code: > > #this part if from the ?plot example: > require(stats) > plot(cars) > lines(lowess(cars)) > #I am trying to use mtext to add the arrow... but I don't know how to do it: > mtext("?", side = 1, line = 0, at = 7) > #that question mark is a place-holder for the arrow. How do I put an up-arrow > there instead of the question mark -- as large as possible?
Use %up% in an expression - but I think it needs two empty {} expressions as arguments: mtext(expression({}%up%{}), side = 1, line = 0, at = 12) Looks pretty good... Barry -- blog: http://geospaced.blogspot.com/ web: http://www.maths.lancs.ac.uk/~rowlings web: http://www.rowlingson.com/ twitter: http://twitter.com/geospacedman pics: http://www.flickr.com/photos/spacedman ______________________________________________ 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.