On 16/11/2012 10:01, Marc Girondot wrote:
I would like to create a function to convert data based on a class using
as.numeric
Similarly, using a plot, I do:
plot.essai <- function(x, ...) {return(x*2)}
d <- 10
class(d) <- "essai"
plot(d)
It works:
[1] 20
attr(,"class")
[1] "essai"
Now same with as.numeric:
as.numeric.essai <- function(x, ...) {return(x*2)}
as.numeric(d)
You need to read the help (as the posting guide asked you to do before
posting):
‘as.numeric’ is a generic function, but S3 methods must be written
for ‘as.double’. It is identical to ‘as.double’ (and ‘as.real’).
The rest of the help page makes clear why using 'numeric' will confuse
others as well as confusing yourself.
It does not work:
[1] 10
Is it possible ?
Thanks a lot
Marc Girondot
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
