[R] Help on PLotting

[Sangeeta Pratap]

We were wondering if there was a simple way to plot two series, say y and 
z, against a series x and have both series appear in the same plot. 

For example the function plot(x~y+z) generates two scatter plots, one with
y against x and the other with z against x. Is there any way to obtain
both on the same picture?  

Thanks for your help 

Sangeeta

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______________________________________________________________________________
Sangeeta Pratap				  email:pratap at itam.mx
Centro de Investigación Económica	  phone:52 55 56284000 extn.2966
Instituto Tecnológico Autónomo de México  fax:  52 55 56284058	
Av. Camino de Santa Teresa 930
10700, Mexico D.F