Dear Michael,
Thanks very much. I have a follow-up question: how did you know that symbol 255
is the up-arrow?
Josh
________________________________
From: Michael Bedward <michael.bedw...@gmail.com>
Cc: R Help <r-help@r-project.org>
Sent: Wed, October 6, 2010 5:09:48 AM
Subject: Re: [R] Pointing to a specific place on the x-axis with an arrow
Hi Josh,
Try this...
mtext(expression(symbol("\255")), side=1, line=0, at=7)
Michael
> 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
>
>
>
>
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>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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