Hello,
array chip wrote:
Hi, I am really puzzled by this. hope someone can help me
I have a 2 small data frames "a" and "b" derived from a larger data frames. They
look exactly the same to me, but identical() always returns FALSE.
a
a b
2 10011048 L
4 10011048 R
6 10011049 L
8 10011049 R
b
a b
1 10011048 L
3 10011048 R
5 10011049 L
7 10011049 R
identical(a,b)
[1] FALSE
Do these really look "exactly the same" to you?
The first column (the row.names) are clearly different, thus they are
not identical.
See ?row.names
some information about the attributes of the 2 data frames:
class(a)
[1] "data.frame"
class(b)
[1] "data.frame"
class(a$a)
[1] "integer"
class(a$b)
[1] "character"
class(b$a)
[1] "integer"
class(b$b)
[1] "character"
However, if I generate these 2 data frame from scratches, identical() would
returns TRUE
x<-as.data.frame(cbind(a=c(10011048,10011048,10011049,10011049),b=c('L','R','L','R')))
)
y<-as.data.frame(cbind(a=c(10011048,10011048,10011049,10011049),b=c('L','R','L','R')))
)
identical(x,y)
[1] TRUE
Looks like a & b objects takes some invisible residual information from the
larger data frame where they were derived, which is not the same between them.
But what is it?
Thanks
John
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and provide commented, minimal, self-contained, reproducible code.
