[R] multiple series on same graph

[Sven Garbade]

Collin Carbno wrote:
> 
> I'm trying to duplicate some graphs from powerpoint in R package.  One
> of things I'm having trouble with is I don't understand how to use the
> points command to create different sets of points with different color
> and marking attributes, and a legend on the graph.  Where should I look?
> I can't seem to find an example of two different sets of data on the
> same graph.

You can use points() or lines() to add points or lines to an existing
plot. See the help pages, there are a lot of examples on how to use
these functions. Use legend() to add a legend to a plot (and there are
also a lot of examples on how to use legend()). But you can also build
your legend with text(), polygon(), lines() etc if you prefer a flexible
style. See (for example)
http://cran.r-project.org/doc/contrib/rpsych.pdf on how to build a
legend with text(), polygon() etc. 

By, Sven
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