[R] S4 classes?

[Spencer Graves]

     The following example, extracted from pp. 38-42 of Chambers (1998) 
Programming with Data (Springer), works for me in S-Plus 6.2 but not R 
1.9.0pat, which returns the indicated error messages: 

> setClass('track', representation(x="numeric", y="numeric"))
[1] "track"
> tr1 <- new("track", x=1:3, y=4:6)
> setMethod("plot",
+ signature(x="track", y="missing"),
+ function(x, y, ...)plot([EMAIL PROTECTED], [EMAIL PROTECTED], ...)
+ )
[1] "plot"
> plot(tr1)
Error in plot.window(xlim, ylim, log, asp, ...) :
       need finite xlim values
In addition: Warning messages:
1: no finite arguments to min; returning Inf
2: no finite arguments to max; returning -Inf
3: no finite arguments to min; returning Inf
4: no finite arguments to max; returning -Inf
     Am I missing something or is my copy of R 1.9.0pat corrupted?  
(This is under Windows 2000.) 

     Thanks Much!
     Spencer Graves
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