Grokbase Groups R r-devel August 2008
FAQ

d <- data.frame(x=1:3, y=2:4)
d[["r"]] <- d[1]/d[2]
d
x y x
1 1 2 0.5000000
2 2 3 0.6666667
3 3 4 0.7500000

It appears that the name "x" was given
instead of "r". That is not correct:
names(d)
[1] "x" "y" "r"
showStructure(d) # from package splus2R
list[3,3] S3 class: data.frame
&row.names numeric[ length 3] class: integer
$x numeric[ length 3] class: integer
$y numeric[ length 3] class: integer
$r list[3,1] S3 class: data.frame
&row.names numeric[ length 3] class: integer
$x numeric[ length 3] class: numeric

print.data.frame calls format.data.frame, which
loses the name "r" and substitutes the name "x".

I suggest that format.data.frame (or print.data.frame)
paste together the names, e.g.
x y r.x
1 1 2 0.5000000
2 2 3 0.6666667
3 3 4 0.7500000
This generalizes to the case that an included data frame
includes two columns. It is also consistent with the
behavior for a data frame containing a matrix.
d <- data.frame(x=1:3, y=2:4, A = I(cbind(a=3:5,b=4:6)))
d
x y A.a A.b
1 1 2 3 4
2 2 3 4 5
3 3 4 5 6
showStructure(d)
list[3,3] S3 class: data.frame
&row.names numeric[ length 3] class: integer
$x numeric[ length 3] class: integer
$y numeric[ length 3] class: integer
$A numeric[3,2] S3 class: AsIs
attributes: dimnames

--please do not edit the information below--

Version:
platform = i486-pc-linux-gnu
arch = i486
os = linux-gnu
system = i486, linux-gnu
status =
major = 2
minor = 7.1
year = 2008
month = 06
day = 23
svn rev = 45970
language = R
version.string = R version 2.7.1 (2008-06-23)

Locale:
LC_CTYPE=en_US;LC_NUMERIC=C;LC_TIME=C;LC_COLLATE=C;LC_MONETARY=C;LC_MESSAGES=en_US;LC_PAPER=en_US;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US;LC_IDENTIFICATION=C

Search Path:
.GlobalEnv, package:Rfixes, package:Rcode, package:aggregate,
package:stats, package:graphics, package:grDevices, package:utils,
package:datasets, package:showStructure, package:splus2R, package:methods,
Autoloads, package:base

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postedAug 27, '08 at 5:05p
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