[R] S4 classes?

[Spencer Graves]

      Thanks to Eryk Wolski, Martin Maechler, Dimitris Rizopoulos and 
Uwe Ligges:  I uninstalled my apparently corrupted R 1.9.0pat and 
installed R 1.9.1 alpha, and at least this simple example now works. 

      Best Wishes,
      spencer graves

Uwe Ligges wrote:

> Spencer Graves wrote:
>
>>      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(x at x, x at y, ...)
>> + )
>> [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
>
>
>
> Works for me with R-1.9.0 Patched (2004-05-24)
>
> Uwe
>