First, if I have an S4 class boo should I define S3 method for
printing print.boo(..) or should I define S4 method print(..).
I mainly need to define print function only because some user might
call it and then I would like to dispatch the call to
right function instead.
Second, it seems that by defining S4 generic function print, it is
possible to break argument hinting on the status bar.
Namely, as I understand, the Mac OS X GUI client makes a call args()
if something like
letter(
is typed to console. Since letter() function does not exists, it
should return nothing to the status bar and nothing to
console, as I as a user have not entered any call, yet. However, if S4
generic print is defined, a mysterious error
message
Error in args(letter) : no function to return from, jumping to top level
appears after typing
letter()
without return('\n') to console. It seems bizarre...
System is
Mac OS X 10.5.8 (PowerPC)
R 2.9.1 GUI 1.28 Tiger build 32-bit (5444)
R version 2.9.1 (2009-06-26)
Minimal amount of code to get the behaviour is
if(!isGeneric("print")) {setGeneric("print",useAsDefault=print)}
What is the underlying problem?
Sven Laur
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