[R] setMethod does not work in Window 7??

From: Fang, Jianwen <jwfang_at_ku.edu>
Date: Thu, 03 Jun 2010 16:05:58 -0500


I am developing a S4 class but have had trouble to make setMethod work in Window 7. I tested an example found in the setMethod manual:  

 > require(graphics)

> setMethod("plot", signature(x="track", y="missing"),

+ function(x, y, ...) plot(slot(x, "x"), slot(x, "y"), ...)

+ )  

It gave me:  

Error in setMethod("plot", signature(x = "track", y = "missing"), function(x, :

  unused argument(s) (function(x, y, ...) plot(slot(x, "x"), slot(x, "y"), ...))  

It works perfectly fine in Linux. Does anybody know why?  

Thanks in advance!

JF    

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