[R] 2d plot with modification of plotting symbol to indicate third dimension.

Greg Snow Greg.Snow at imail.org
Wed Jan 12 21:26:29 CET 2011

Look at the symbols function for some options of doing what you suggest (you can also do a search for "bubble plot" for a couple of other implementations).  If you want to go a bit further than what symbols does for you then look at the my.symbols function in the TeachingDemos package.

Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of John Sorkin
> Sent: Wednesday, January 12, 2011 12:19 PM
> To: r-help at r-project.org
> Subject: [R] 2d plot with modification of plotting symbol to indicate
> third dimension.
> I would like to plot 3-dimensional data on a two-dimensional scatter-
> plot.
> Is there a way I can automatically modify the plot symbol (e.g.
> changing size or color) to indicate the value of a third variable? E.g.
> How can I plot weight vs. age and indicate the value of muscle mass for
> each value weight-age pair by making the plot point proportional to the
> subject's muscle mass?
> Thanks,
> John
> John David Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
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