[Rd] unexpected '[-.data.frame' result
Is this a bug? If not, I am curious to know why '[-.data.frame' was designed to yield a.frame$y != a.frame$z rather than refusing to carry out the operation at all. a.frame - data.frame( x=letters[1:5] ) a.frame[ 2:5, y ] - letters[2:5] a.frame[[ z ]][ 2:5 ] - letters[2:5] a.frame xyz 1 ab NA 2 bcb 3 cdc 4 ded 5 e NAe Chuck Charles C. Berry(858) 534-2098 Dept of Family/Preventive Medicine E mailto:[EMAIL PROTECTED] UC San Diego http://biostat.ucsd.edu/~cberry/ La Jolla, San Diego 92093-0717 __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] unexpected '[-.data.frame' result
Charles C. Berry [EMAIL PROTECTED] writes:
Is this a bug?
If not, I am curious to know why '[-.data.frame' was designed to yield
a.frame$y != a.frame$z rather than refusing to carry out the operation at
all.
a.frame - data.frame( x=letters[1:5] )
a.frame[ 2:5, y ] - letters[2:5]
a.frame[[ z ]][ 2:5 ] - letters[2:5]
a.frame
xyz
1 ab NA
2 bcb
3 cdc
4 ded
5 e NAe
It sure looks like a bug, and we're not even prototype-compatible:
turmalin:~/Splus
S-PLUS : Copyright (c) 1988, 2003 Insightful Corp.
S : Copyright Lucent Technologies, Inc.
Version 6.2.1 for Linux 2.4.18 : 2003
Working data will be in /home/bs/pd/MySwork
a.frame - data.frame( x=letters[1:5] )
a.frame[ 2:5, y ] - letters[2:5]
a.frame
x y
1 a
2 b b
3 c c
4 d d
5 e e
(S-PLUS doesn't know about character NA, so it's not surprising that
you get an empty cell, but it does fill in the right rows of y).
Why would you expect the operation to be refused?
The problem is not, BTW, restricted to character column indexing:
a.frame
x y V3
1 a bb
2 b bc
3 c cd
4 d de
5 e e NA
The problem would seem to be the else clause in
if (jj = nvars) {
if (length(dim(x[jj])) != 2)
x[[jj]][iseq] - vjj
else x[[jj]][iseq, ] - vjj
}
else {
length(vjj) - nrows
x[[jj]] - vjj
}
which I think wants to be
else {
x[[jj]] - vjj[FALSE]
length(x[[jj]]) - nrows
x[[jj]][iseq] - vjj
}
--
O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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Re: [Rd] unexpected '[-.data.frame' result
On Wed, 26 Oct 2005, Peter Dalgaard wrote: Charles C. Berry [EMAIL PROTECTED] writes: Is this a bug? If not, I am curious to know why '[-.data.frame' was designed to yield a.frame$y != a.frame$z rather than refusing to carry out the operation at all. a.frame - data.frame( x=letters[1:5] ) a.frame[ 2:5, y ] - letters[2:5] a.frame[[ z ]][ 2:5 ] - letters[2:5] a.frame xyz 1 ab NA 2 bcb 3 cdc 4 ded 5 e NAe It sure looks like a bug, and we're not even prototype-compatible: [stuff deleted] Why would you expect the operation to be refused? I was having trouble deciding if the use of whole in the Extract.data.frame help page was a warning against creating columns with only some entries present: The replacement methods can be used to add whole column(s)... [rest deleted] Charles C. Berry(858) 534-2098 Dept of Family/Preventive Medicine E mailto:[EMAIL PROTECTED] UC San Diego http://biostat.ucsd.edu/~cberry/ La Jolla, San Diego 92093-0717 __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
