It took me some time to find this bug in my code. Is this a feature of
R? Am I doing something wrong?
> a=data.frame(x=1:10,y=1:10)
> b=data.frame(x=11:20,y=11:20)
> z=data.frame(1:10,11:20)
> a$z=z
> b$z=z
> rbind(a,b)
Error in `row.names<-.data.frame`(`*tmp*`, value = c("1", "2", "3",
"4", :
duplicate 'row.names' are not allowed
In addition: Warning message:
non-unique values when setting 'row.names': ‘1’, ‘10’, ‘2’, ‘3’, ‘4’,
‘5’, ‘6’, ‘7’, ‘8’, ‘9’
adding rownames to a and b doesn't help:
> rownames(a)=1:10
> rownames(b)=11:20
> rbind(a,b)
Error in `row.names<-.data.frame`(`*tmp*`, value = c("1", "2", "3",
"4", :
duplicate 'row.names' are not allowed
In addition: Warning message:
non-unique values when setting 'row.names': ‘1’, ‘10’, ‘2’, ‘3’, ‘4’,
‘5’, ‘6’, ‘7’, ‘8’, ‘9’
the problem is with the rownames of a$z and b$z...
> rownames(a$z)=1:10
> rownames(b$z)=11:20
> rbind(a,b)
x y z.X1.10 z.X11.20
1 1 1 1 11
2 2 2 2 12
3 3 3 3 13
4 4 4 4 14
5 5 5 5 15
6 6 6 6 16
7 7 7 7 17
8 8 8 8 18
9 9 9 9 19
10 10 10 10 20
11 11 11 1 11
12 12 12 2 12
13 13 13 3 13
14 14 14 4 14
15 15 15 5 15
16 16 16 6 16
17 17 17 7 17
18 18 18 8 18
19 19 19 9 19
20 20 20 10 20
I was creating data.frames with data.frame members when I was doing
computations on the data.frames.
Something like:
> a=data.frame(x=1:10,y=1:10)
> b=data.frame(x=11:20,y=11:20)
> a$z=a*2
> b$z=b*2
> rbind(a,b)
Error in `row.names<-.data.frame`(`*tmp*`, value = c("1", "2", "3",
"4", :
duplicate 'row.names' are not allowed
In addition: Warning message:
non-unique values when setting 'row.names': ‘1’, ‘10’, ‘2’, ‘3’, ‘4’,
‘5’, ‘6’, ‘7’, ‘8’, ‘9’
Thanks for listening,
Michael
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