[R] Recursive Indexing Failed

[Patrick Breheny]

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