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 -- Jetzt informieren: http://mobile.1und1.de/?ac=OM.PW.PW003K20328T7073a ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.