On May 9, 2011, at 15:24 , Alaios wrote:
> So the only thing that might work is a for..loop to collect all these
> together?
An implicit loop using lapply/sapply might be more like it:
lapply(CRagentInTime[[1]]$CRagent[1:10], "[[", "sr")
Notice that fancy indexing usually requires "[", not "[[".
>
> Best REgards
> Alex
>
> --- On Mon, 5/9/11, Patrick Breheny <patrick.breh...@uky.edu> wrote:
>
>> From: Patrick Breheny <patrick.breh...@uky.edu>
>> Subject: Re: [R] Recursive Indexing Failed
>> To: "Alaios" <ala...@yahoo.com>
>> Cc: "R-help@r-project.org" <R-help@r-project.org>
>> Date: Monday, May 9, 2011, 2:18 PM
>> On 05/09/2011 08:58 AM, Alaios
>> wrote:
>>> Dear all,
>>> I would like to ask your help concerning an error
>> message I get.
>>>
>>> I have the following struct
>>>
>>> str(CRagentInTime[[1]])
>>> List of 2
>>> $ timelag: int 0
>>> $ CRagent:List of 50
>>> ..$ :List of 3
>>> .. ..$ CRmap: num [1:256, 1:256] NA NA NA
>> NA NA NA NA NA NA NA ...
>>> .. ..$ xy : num [1:2] 10
>> 177
>>> .. ..$ sr : num [1:49]
>> -94.9 -92.8 -79.5 -97.6 -78.4 ...
>>>
>>> and I wanted to select all the sr fields for every of
>> each one of the 50 CRagent Lists I have.
>>>
>>> So I tried something like
>>>
>>> str(CRagentInTime[[1]][[2]][[1:10]]$sr) and I get a
>> message that
>>> Error in CRagentInTime[[1]][[2]][[1:10]] :
>>> recursive indexing failed at level 3
>>
>> Selecting multiple elements of a list using an expression
>> like [[1:10]]
>> does not work. For example:
>>
>> x <- list("a","b")
>> x[[1:2]]
>>
>> produces
>>
>> Error in x[[1:2]] : subscript out of bounds
>>
>> In general, the expression x[[1:2]] is not meaningful, as
>> the elements
>> of the list may be of different type, with no way to
>> concatenate them.
>>
>>>
>>> strange to me is that this one works
>>>
>>> str(CRagentInTime[[1]][[2]][[1]]$sr)
>>> num [1:49] -106 -92.9 -101.3 -81.9
>> -96.7 ...
>>>
>>>
>>> I would like to thank you in advance for your help
>>> Best Regards
>>> Alex
>>>
>> _______________________
>> Patrick Breheny
>> Assistant Professor
>> Department of Biostatistics
>> Department of Statistics
>> University of Kentucky
>>
>
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--
Peter Dalgaard
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd....@cbs.dk Priv: pda...@gmail.com
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