[R-sig-Geo] Accessing the ids of neighbours in spdep

[Kenny Bell]

Hi all,

This last one was what I was after:

lapply(xx, function(x) paste(attr(xx, "region.id")[x], collapse = ", "))

Thanks so much!
Kenny


On Mon, Sep 29, 2014 at 2:53 AM, Roger Bivand <Roger.Bivand at nhh.no> wrote:

> On Mon, 29 Sep 2014, Frede Aakmann Tøgersen wrote:
>
>  Hi
>>
>> I'm not really sure I understand you but perhaps something like this:
>>
>> lapply(xx, paste, collapse = ", ")
>>
>
> Yes, this is the closest we can get without more input from Kenny.
>
> This gives the 1-base integer indices in a list of single element
> character vectors. If the output should be a character vector with the same
> number of elements as the input:
>
> lapply(xx, as.character)
>
> will do it. But the IDs of the underlying entities (could be FIPS, NUTS3,
> whatever) are in attr(xx, "region.id"), so to get those:
>
> lapply(xx, function(x) attr(xx, "region.id")[x])
>
> is needed, or if a list of single element character vectors is required:
>
> lapply(xx, function(x) paste(attr(xx, "region.id")[x], collapse = ", "))
>
> Here the IDs are 0-based rather than 1-based, but the attr(xx, "region.id")
> values are arbitrary - they are taken from row.names() of the spatial
> object unless given as an argument to functions creating the "nb" object.
>
> Hope this clarifies,
>
> Roger
>
>
>
>> Yours sincerely / Med venlig hilsen
>>
>>
>> Frede Aakmann Tøgersen
>> Specialist, M.Sc., Ph.D.
>> Plant Performance & Modeling
>>
>> Technology & Service Solutions
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>>
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>>
>>  -----Original Message-----
>>> From: r-sig-geo-bounces at r-project.org [mailto:r-sig-geo-bounces at r-
>>> project.org] On Behalf Of Kenny Bell
>>> Sent: 29. september 2014 00:10
>>> To: r-sig-geo at r-project.org
>>> Subject: [R-sig-Geo] Accessing the ids of neighbours in spdep
>>>
>>> Hi,
>>>
>>> I am trying to get an actual list of neighbour ids out of an nb object.
>>> For
>>> example, I have
>>>
>>> library(spdep)
>>> example(columbus)
>>> xx <- poly2nb(columbus)
>>>
>>> What would be my command to get the list of neighbours as a list of
>>> character vectors?
>>>
>>> Thanks so much for any help,
>>> Kenny
>>>
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>>>
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>>> R-sig-Geo at r-project.org
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>>
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>>
> --
> Roger Bivand
> Department of Economics, Norwegian School of Economics,
> Helleveien 30, N-5045 Bergen, Norway.
> voice: +47 55 95 93 55; fax +47 55 95 91 00
> e-mail: Roger.Bivand at nhh.no
>



-- 
Kendon Bell
Email: kmb56 at berkeley.edu
Phone: (510) 612-3375

Ph.D. Student
Department of Agricultural & Resource Economics
University of California, Berkeley

Graduate Student Researcher
Energy Biosciences Institute
http://www.energybiosciencesinstitute.org/

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