[R] plotting question

[Douglas Bates]

Thaddeus Tarpey <thaddeus.tarpey at wright.edu> writes:

> I would like to plot two different samples on the same scatterplot in R
> using different symbols for the different groups.
> Could someone please let me know how this can be done?

One way is to use the pch argument to the plot function, as in

 > library(MASS)
 > data(michelson)
 > plot(Speed ~ as.integer(Run), data = michelson, pch = as.integer(Expt))
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