How is this a bug? From the help page for cbind/rbind:
Description
Take a sequence of vector, matrix or data frames arguments and
combine by _columns_ or _rows_, respectively.
(emphasis added)
Note that it does _not_ say "combine by variable names".
Peter Ehlers
[EMAIL PROTECTED] wrote:
> Full_Name: Rafal Kustra
> Version: 2.1.1
> OS: Linux, MacOS 10.3
> Submission from: (NULL) (69.195.47.62)
>
>
> When Rbinding two data frames with factors, strange result occur (but no
> error)
> when the order of data frame variables is different in two data frames:
>
>
>>d1=as.data.frame(list(x=1:10,y=letters[1:10]))
>>d2=as.data.frame(list(y=LETTERS[1:5],x=7:11))
>>d2
>
> y x
> 1 A 7
> 2 B 8
> 3 C 9
> 4 D 10
> 5 E 11
>
>>rbind(d1,d2)
>
> x y
> 1 1 a
> 2 2 b
> 3 3 c
> 4 4 d
> 5 5 e
> 6 6 f
> 7 7 g
> 8 8 h
> 9 9 i
> 10 10 j
> 11 7 <NA>
> 21 8 <NA>
> 31 9 <NA>
> 41 10 <NA>
> 51 11 <NA>
> Warning message:
> invalid factor level, NAs generated in: "[<-.factor"(`*tmp*`, ri, value =
> c("A",
> "B", "C", "D", "E"))
>
>
> Things work correctly when the order of variables is the same:
>
>
>>d3=as.data.frame(list(x=7:11,y=LETTERS[1:5]))
>>rbind(d1,d3)
>
> x y
> 1 1 a
> 2 2 b
> 3 3 c
> 4 4 d
> 5 5 e
> 6 6 f
> 7 7 g
> 8 8 h
> 9 9 i
> 10 10 j
> 11 7 A
> 21 8 B
> 31 9 C
> 41 10 D
> 51 11 E
>
>
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