Hello,
Documentation for data.frame says,
"If a list or data frame or matrix is passed to data.frame it is as if
each column had been passed as a separate argument, with the exception
of matrices of class model.matrix. ".
This is not quite true:
> data.frame(a = 1:2, b = 1:4, c = 1:8) # replicates vectors as
necessary
a b c
1 1 1 1
2 2 2 2
3 1 3 3
4 2 4 4
5 1 1 5
6 2 2 6
7 1 3 7
8 2 4 8
but if one tries to combine a vector with a data.frame that needs to be
replicated, one gets:
> data.frame(data.frame(a = 1:2, b = 1:4), c = 1:8)
Error in data.frame(data.frame(a = 1:2, b = 1:4), c = 1:8) :
arguments imply differing number of rows: 4, 8
On the other hand, if one combines a data.frame with a vector that needs
to be replicated, it works:
> data.frame(data.frame(a = 1:8, b = 1:4), c = 1:2)
a b c
1 1 1 1
2 2 2 2
3 3 3 1
4 4 4 2
5 5 1 1
6 6 2 2
7 7 3 1
8 8 4 2
Is the behavior my second example intended? It would seem more
convenient if the rows of the data.frame were replicated as needed. If
it is intended behavior, a word about this in the documentation might be
helpful.
> version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 1
minor 5.1
year 2002
month 06
day 17
language R
Thanks,
Jim Rogers
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