[R] different subscripting behaviour using $<- or [<- for data.frames

[Jens Oehlschlägel-Akiyoshi]

Before sending to r-bugs, I ask here:

If

> char <- letters[1:2]
> fac <- factor(char)
> dd <- data.frame(char=I(char), fac=fac)

then

> dd[,"char"] <- char
> dd[,"char"]
[1] a b
Levels:  a b

and

> dd$char <- char
> dd$char
[1] "a" "b"

are different.

After the latter operation the data.frame contains a character column, which
neither has attribute "AsIs" nor has been converted to class factor. Is this
intended?


platform Windows
arch     x86
os       Win32
system   x86, Win32
status
major    0
minor    90.1
year     1999
month    December
day      15
language R

--
Dr. Jens Oehlschlägel-Akiyoshi
MD FACTORY GmbH
Bayerstrasse 21

80335 München

Tel.: 089 545 28-27
Fax.: 089 545 28-10
http://www.mdfactory.de

Standard Disclaimers: Opinions expressed here are personal
and are not otherwise represented.


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