[R] Pointing to a specific place on the x-axis with an arrow

[Michael Bedward]

Hi Josh,

Try this...

mtext(expression(symbol("\255")), side=1, line=0, at=7)

Michael


On 6 October 2010 11:45, Josh B <joshb41 at 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?
>
> Many thanks to all of you in advance.
> -----------------------------------
> Josh Banta, Ph.D
> Center for Genomics and Systems Biology
> New York University
> 100 Washington Square East
> New York, NY 10003
> Tel: (212) 998-8465
> http://plantevolutionaryecology.org
>
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.
>