[R] Stumped on methods

Uwe Ligges ligges at statistik.uni-dortmund.de
Fri Jul 16 14:24:31 CEST 2004

Jim Lemon wrote:

> I have been trying to write a "proper" print method for a package, and have 
> almost gotten what I want. From a reading of the relevant section in R 
> Extensions and the introduction to methods, I've stuck the whole business 
> into a character object and used:
> NextMethod("print")

Well, it depends.
If you have some inheritance of classes, you may reallay want to use 
NextMethod(), but that's not necessary if you want to write your own 
print method print.myclass() to print stuff that is not from any 
Check out how to write methods in, e.g., Venables and Ripley (2000): "S 
Programming", Springer.

Uwe Ligges

> However, instead of not printing quotes and displaying the usual 
> representation of the string, I get the whole string, newlines and all, in 
> quotes. My attempt to shamelessly copy someone else's print method 
> was foiled as most of them don't display when one types the function name. I 
> presume this is a feature of namespaces.
> Needless to say, searching the archives for "print & method" retrieved a 
> cornucopia of useless information. I wonder if anyone would be kind enough to 
> inform me where to look for the proper incantation? Thanks.
> RedHat EL3 L:inux
> R-1.9.1
> Last.Drink - Aurora Expresso
> Jim
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