[R] Private methods
maustin at amgen.com
Sat Aug 14 03:34:22 CEST 2004
.class1 is an 'internal' method in the namespace of the package 'methods'.
It can be accessed with the ::: operator. A good start for documentation
may be Vol 3/1 of R-News.
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of Matthew Walker
Sent: Friday, August 13, 2004 17:19 PM
To: r-help at stat.math.ethz.ch
Subject: [R] Private methods
I'm trying to understand R's object oriented abilities.
I have read (in a very recent email to r-help) that R's methods package
does not support private methods. However, I also looked at the source
for the function "is":
function (object, class2)
cl <- .class1(object)
if (.identC(cl, class2) || .identC(class2, "ANY"))
The first line of the function, the assignment to cl, seems to call a
function called ".class1". I was unable to see the source for ".class1":
Error: Object ".class1" not found
It seems to me that either (a) I don't understand what I'm doing, or (b)
".class1" is a very private method. The help system finds nothing about
Could someone please help me to understand this. Most helpful of all
would be pointers on where I could find more information. (So far I
have found only two documents on R's object oriented abilities: "A
guide to using S4 Objects" and "A draft of the R language definition".)
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