Dear R-users,
I am somewhat puzzled by how R treats data frames with nested data frames.
Below are a couple of examples, maybe someone could help explain what the
guiding logic here is.
## construct plain data frame
> z <- data.frame(x=1)
## add a data frame member
> z$y <- data.frame(a=1,b=2)
## puzzle 1: z is apparently different from a straightforward construction of
the 'same' object
> all.equal(z, data.frame(x=1,y=data.frame(a=1,b=2)))
[1] "Names: 1 string mismatch"
"Length mismatch: comparison on first 2 components"
[3] "Component 2: Modes: list, numeric"
"Component 2: names for target but not for current"
[5] "Component 2: Attributes: < Modes: list, NULL >"
"Component 2: Attributes: < names for target but not for current >"
[7] "Component 2: Attributes: < Length mismatch: comparison on first 0
components >" "Component 2: Length mismatch: comparison on first 1 components"
## puzzle 2: could not rbind z
> rbind.data.frame(z, z)
Error in `row.names<-.data.frame`(`*tmp*`, value = c("1", "1")) :
duplicate 'row.names' are not allowed
In addition: Warning message:
non-unique value when setting 'row.names': '1'
> version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 2
minor 9.1
year 2009
month 06
day 26
svn rev 48839
language R
version.string R version 2.9.1 (2009-06-26)
Thanks,
Vadim
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