[Rd] possible BUG with as.data.frame() and/or [.data.frame

[Jens Oehlschlägel-Akiyoshi]

Here is a possible BUG with as.data.frame() and/or [.data.frame which broke
Michael Lapsleys RODBC-Code.
Can anyone confirm it is a bug or a 'feature' of the prototype?


tablename <- "abc"
a <- as.data.frame(cbind("abc", 1:3))
b <- as.data.frame(cbind(tablename, 1:3))

# ok
> a
   V1 V2
1 abc  1
2 abc  2
3 abc  3

# missing column name
> b
  tablename
1       abc 1
2       abc 2
3       abc 3

# subsetting ok
> b[1,1]
[1] abc
Levels:  abc

# subsetting fails
> b[1,2]
Error in [.data.frame(b, 1, 2) : undefined columns selected


##by contrast
> data.frame(cbind(tablename, 1:3))
  tablename Var.2
1       abc     1
2       abc     2
3       abc     3

Regards


--
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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