Hello.
Suppose you define a new S4-class, say
setClass(track, representation(x=numeric, y=numeric))
Don't worry if you have a deja vu, it's from the help page.
Your new class is said to have a fixed structure: two slots, x, and y,
and that should apply to all objects you construct as members
Under R 2.3.1 these work as you indicate but under R 2.4.0
they all give errors:
setClass(track, representation(x=numeric, y=numeric))
[1] track
tr - new( track )
tr[ ping ] - pong
Error in [-(`*tmp*`, ping, value = pong) :
object is not subsettable
tr$bingo - bongo
Error: cannot
I think you're right---this shouldn't happen in theory, but it does because of
the internal representation of S4 objects in R.
In R devel (to be 2.4.0), this changes and I believe your example will no
longer
work.
-roger
Jörg Beyer wrote:
Hello.
Suppose you define a new S4-class, say
Gabor, Roger,
thanks a lot for your immediate answers.
Knowing that this is subject to change means a lot less coding for me :-)
Good news ... for me, and first of all for the impressing S4 system.
Thanks again
Joerg
Am 28.08.2006 16:08 Uhr schrieb Gabor Grothendieck
([EMAIL PROTECTED]):
