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 [email protected] 801.408.8111 > -----Original Message----- > From: [email protected] [mailto:r-help-boun...@r- > project.org] On Behalf Of John Sorkin > Sent: Wednesday, January 12, 2011 12:19 PM > To: [email protected] > 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) > > Confidentiality Statement: > This email message, including any attachments, is for > th...{{dropped:6}} > > ______________________________________________ > [email protected] 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. ______________________________________________ [email protected] 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.
