Theoph is in the datasets package, so it should be
available in all versions of R:
class(Theoph)
[1] "nfnGroupedData" "nfGroupedData" "groupedData" "data.frame"
The key to what's happening is that there are some methods
for groupedData objects in the nlme library, which I suspect
the original poster had loaded in Windows, but not Unix.
Here's what I see on a Linux system:
all(paste(Theoph[1],Theoph[2])==paste(Theoph[[1]],Theoph[[2]]))
[1] FALSE
library(nlme)
all(paste(Theoph[1],Theoph[2])==paste(Theoph[[1]],Theoph[[2]]))
[1] TRUE
So if nlme is loaded, the following methods are available for
groupedData objects:
methods(class='groupedData')
[1] as.data.frame.groupedData* asTable.groupedData*
[3] collapse.groupedData* formula.groupedData*
[5] [.groupedData* isBalanced.groupedData*
[7] lme.groupedData* lmList.groupedData*
[9] print.groupedData* update.groupedData*
Thus subscripting for these objects is performed differently when
the nlme package is loaded.
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Thu, 7 May 2009, Gavin Simpson wrote:
On Thu, 2009-05-07 at 09:38 -0500, Jun Shen wrote:
Hi, everyone,
Try the following command to see if you get TRUE or FALSE. I get FALSE on a
unix platform but TRUE on Windows. Any comment?
all(paste(Theoph[1],Theoph[2])==paste(Theoph[[1]],Theoph[[2]]))
And what is Theoph? Please do read the posting guide and provide a
reproducible example.
Is Theoph a list?
a <- list(A = rnorm(10), B = rnorm(10))
paste(a[1], a[2])
[1] "c(0.511810414967963, 0.165995305876871, 1.22637694512945,
-0.496453787173788, 0.325876407556065, 1.97392856823209,
-0.228962880984580, -0.172306887133861, -0.881280038259407,
-0.216958955239245) c(-0.281058662811336, 0.918418337792562,
-1.44005513590710, 0.22857441100305, 0.840138552938062,
0.0555436312146647, -0.602645008995437, -0.158866265592772,
0.959478898002479, -0.892389972305427)"
paste(a[[1]], a[[2]])
[1] "0.511810414967963 -0.281058662811336"
[2] "0.165995305876871 0.918418337792562"
[3] "1.22637694512945 -1.44005513590710"
[4] "-0.496453787173788 0.22857441100305"
[5] "0.325876407556065 0.840138552938062"
[6] "1.97392856823209 0.0555436312146647"
[7] "-0.228962880984580 -0.602645008995437"
[8] "-0.172306887133861 -0.158866265592772"
[9] "-0.881280038259407 0.959478898002479"
[10] "-0.216958955239245 -0.892389972305427"
typeof(a[[1]])
[1] "double"
typeof(a[1])
[1] "list"
If it is, note that [ and [[ do not return the same thing for a list and
as such it is not surprising that they are not equal, pasted or
otherwise.
G
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Dr. Gavin Simpson [t] +44 (0)20 7679 0522
ECRC, UCL Geography, [f] +44 (0)20 7679 0565
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Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/
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