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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