[R] Adding circles or ellipses to graphs

Greg Snow Greg.Snow at intermountainmail.org
Mon Oct 1 17:12:27 CEST 2007

For circles look at the symbols function.  For ellipses see the ellipse package and the my.symbols function in the TeachingDemos package.

-----Original Message-----
From: "Friedman, Steven" <sfriedma at sfwmd.gov>
To: "r-help at r-project.org" <r-help at r-project.org>
Sent: 10/1/07 7:10 AM
Subject: [R] Adding circles or ellipses to graphs



I'm developing an ordination using metaMDS (package vegan). The analysis
identifies 3 distinct groups that I'd like to define by either adding
circles or ellipses to help identify the groups.  The data set is a
spatial temporal data base depicting change in each of 4 areas over 3
time periods.


I can add lines that would link each of the time - x - area
trajectories, but I'd like to add a circle or an ellipse to these as


Does anyone have any suggestions?


Steve Friedman, PhD

Everglades Division

Senior Environmental Scientist, Landscape Ecology

South Florida Water Management District

3301 Gun Club Road

West Palm Beach, Florida 33406

email:  sfriedma at sfwmd.gov

Office:  561 - 682 - 6312

Fax:      561 - 682 - 5980


If you are not doing what you truly enjoy its your obligation to
yourself to change.


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