On 11-01-12 9:33 PM, John Sorkin 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?
Just set cex to the other variable. For example,
plot(1:10, 1:10, cex=1:10)
Similarly, col and pch can be set to vector values, which are recycled
through the points.
Duncan Murdoch
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