[R] interesting feature

[Philipp Pagel]

	Hi!

On Wed, Feb 18, 2004 at 10:45:23AM -0600, Svetlana Eden wrote:
> > d <- rbind(d, add)
> > d
>     x  y
> 1   1 99
> 2  10 55
> 11 14 99
> ######### it would be more natural to index the rows: 1,2,3 instead of
> #1,2,11  ?!

What you see in the first column are row-names not indexes. Since both
data frames had a row named '1' there was a conflict which R is trying
to resolve by appending '1'.

> ######### especially if index '11' is not functioning...
...
> ######### now I would think that the next index should be 21, BUT:
...
> ######### so what is the intuition of such indexing?

I think it all becomes clear if you try this:

> a <- data.frame(foo=1:5, bar=10:6, row.names=LETTERS[1:5])
> a
  foo bar
A   1  10
B   2   9
C   3   8
D   4   7
E   5   6
> b <- data.frame(foo=c(9,10), bar=c(99,98), row.names=c('A','B'))
> b
  foo bar
A   9  99
B  10  98
> rbind(a,b)
   foo bar
A    1  10
B    2   9
C    3   8
D    4   7
E    5   6
A1   9  99
B1  10  98

cu
	Philipp

-- 
Dr. Philipp Pagel                                Tel.  +49-89-3187-3675
Institute for Bioinformatics / MIPS              Fax.  +49-89-3187-3585
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http://mips.gsf.de/~pagel