Dear Spencer,
I do not encounter any problem running your code in my machine. Maybe
is something wrong with your R installation!
setClass('track', representation(x="numeric", y="numeric"))
tr1 <- new("track", x=1:3, y=4:6)
plot.track <- function(x, y, ...){
plot([EMAIL PROTECTED], [EMAIL PROTECTED], xlab="x", ylab="y")
}
setMethod("plot", signature(x="track", y="missing"), plot.track)
## or
setMethod("plot", signature(x="track", y="missing"), function(x, y,
...) plot([EMAIL PROTECTED], [EMAIL PROTECTED], ...))
## both work
plot(tr1)
Best,
Dimitris
----- Original Message -----
From: "Spencer Graves" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, June 02, 2004 10:32 AM
Subject: [R] S4 classes?
> 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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