[R] Specifying the color of points and the plot symbol to be used on a graph

Peter Alspach Peter.Alspach at plantandfood.co.nz
Mon Apr 11 04:59:46 CEST 2011

Tena koe John

If I understand you correctly I think it is easier than that:

plot(x, y, col=yourColourVariate, pch=yourPchVariate)

where yourColourVariate and yourPchVariate are numeric variates of the same lengths as x and y (recycling occurs).  Actually the former can be a character variate of legal names.

HTH ....

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of John Sorkin
> Sent: Monday, 11 April 2011 2:29 p.m.
> To: r-help at r-project.org
> Subject: [R] Specifying the color of points and the plot symbol to be
> used on a graph
> R 2.12.2
> Windows 7
> I would like to know how to specify the color used in plotting points
> on a scatter plot, generated using plot(x,y) and how I can specify the
> particular symbol used. I would like, for example, to plot some points
> as blue circles and other points a red squares. If someone will tell me
> how to specify the symbol and color used when plotting points, I can
> overlay graphs [par(new=TRUE] to get the two colors I desire.
> 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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