[R] Plotting question and Control Charts

[Stephen Arthur]

Hi,

In R, how does one make a plot 

plot(x,y)

where x and y are either continuous or discrete but
you want to plot point (and lines) separately on the
same graph for a third variable, I guess factor, z?

In SAS this could be done by doing:

plot x*y = z;

Any help out there.

Also, what are R's capabilities for producing 'control
charts' and 'pareto charts'.  I haven't really worked
with them before so I don't know what it entails.  

Thanks,

steve

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