have you taken a look at the hexbin package? 'cex' , 'pch' & 'col' will let you
make the changes
Sent from my iPad
On Jan 12, 2011, at 21:33, "John Sorkin" <jsor...@grecc.umaryland.edu> wrote:
> 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:
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