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

Jens Oehlschlägel-Akiyoshi (jens.oehlschlaegel-akiyoshi@mdfactory.de)
Wed, 22 Dec 1999 16:27:13 +0100

• Next message: Troels Ring: "[R] different subscripting behaviour using $<- or [<- for data.frames"
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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
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• Next message: Troels Ring: "[R] different subscripting behaviour using $<- or [<- for data.frames"
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