Export the default method (and otehr methods) from your NAMESPACE? See
Writing R Extensions about the S3method directive.
Note that print.f is the print method for a class f, while f is a
generic function, both fs are unrelated.
Uwe Ligges
On 02.04.2012 12:02, Johannes Radinger wrote:
Hello,
I already posted that on stackoverflow[1], but although it's crossposting,
I think this question can probably easier to be answered by other R-users on
this list, which maintain packages etc.
I would like to make a package out of a function. The function
is working in a script, but when I install and load it as library()
I get an error. The example-function is:
#Make generic function
f<- function(x,...) UseMethod("f")
#Default method
f.default<- function(a,b=5,c=3,...){
out<- a+b+c
class(out)<- "f"
out
}
# Print method
print.f<- function(x,...){
cat("Result for f: ")
print(unclass(x))
}
In the NAMESPACE for export I set "f".
When I try to run the function from the package I get:
Error in UseMethod("f") :
no applicable method for 'f' applied to an object of class "c('double',
'numeric')"
here some additional info:
sessionInfo()
R version 2.14.2 (2012-02-29)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] fishmove_0.0-1 plyr_1.7.1 ggplot2_0.9.0
loaded via a namespace (and not attached):
[1] colorspace_1.1-1 dichromat_1.2-4 digest_0.5.1 grid_2.14.2
MASS_7.3-17
[6] memoise_0.1 munsell_0.3 proto_0.3-9.2
RColorBrewer_1.0-5 reshape2_1.2.1
[11] scales_0.2.0 stringr_0.6
Can anyone explain me how to solve that resp. how to make my own function into
a package?
Best regards,
Johannes
[1]:
http://stackoverflow.com/questions/8430178/arguments-and-classes-for-writing-generic-functions-in-r
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