Thanks for everyone's attention on this issue!

On Thu, May 7, 2009 at 11:20 AM, Phil Spector <spector@stat.berkeley.edu>wrote:

> 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
>                                         spector@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
>> Pearson Building,             [e] gavin.simpsonATNOSPAMucl.ac.uk
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>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>


-- 
Jun Shen PhD
PK/PD Scientist
BioPharma Services
Millipore Corporation
15 Research Park Dr.
St Charles, MO 63304
Direct: 636-720-1589

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