In playing around with data.frames (and wanting a simple, cheap way to
use the variable and case names in plots; but I've solved that with
some hacks, yech), I noticed the following behavior with subsetting.
testdata <- data.frame(matrix(1:20,nrow=4,ncol=5))
names(testdata) ## expect labels, get them
names(testdata[2,]) ## expect labels, get them
names(testdata[,2]) ## expect labels, but NOT -- STRIPPED OFF??
testdata[,2] ## would have expect a name (X2) in the front? NOT EXPECTED
testdata[2,] ## get what I expect
testdata[2,2] ## just a number, not a sub-data.frame? unexpected
testdata[2,2:3] ## this is a data.frame
testdata[2:3,2:3] ## and this is, too.
> version
_
platform i386-pc-linux-gnu
arch i386
os linux-gnu
system i386, linux-gnu
status alpha
major 1
minor 8.0
year 2003
month 09
day 20
language R
>
I don't have 1.7.1 handy at this location to test, but I would've
expected a data.frame-like object upon subsetting; should I have
expected otherwise? (granted, a data.frame with just a single
variable could be thought of as silly, but it does have some extra
information that might be worthwhile, on occassion?)
I'm not sure that it is a bug, but I was caught by suprise. If it
isn't a bug, and someone has a concise way to think through this, for
my future reference, I'd appreciate hearing about it.
best,
-tony
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Biostatistics, SCHARP/HVTN Fred Hutchinson Cancer Research Center
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