[R] newbie graphics question

[Myriam Abramson]

Hi!

I need to plot two lines on the same graph. I do
plot(x,y)
then 
plot(x,z,add=TRUE)

but I get the following warning messages
Warning messages: 
1: parameter "add" couldn't be set in high-level plot() function 
2: parameter "add" couldn't be set in high-level plot() function 
3: parameter "add" couldn't be set in high-level plot() function 
4: parameter "add" couldn't be set in high-level plot() function 
5: parameter "add" couldn't be set in high-level plot() function 
6: parameter "add" couldn't be set in high-level plot() function 

Thanks for  your help.
-- 
                                   myriam

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