[R-sig-Geo] knearneigh: data non-numeric

[Andreas Forø Tollefsen]

Absolutely. I think it was just too early in the morning.
I forgot the difference between using poly2nb and knearneigh.
Using coordinates() works fine.

Sorry for the confusion.


2014-09-12 10:06 GMT+02:00 Roger Bivand <Roger.Bivand at nhh.no>:

> On Fri, 12 Sep 2014, Andreas Forø Tollefsen wrote:
>
>  Hi all,
>>
>> I have never experienced this issue before, but I assume there is
>> something
>> in my spatialpolygondataframe causing this.
>> Whenever I try to create a knn object using these data, I get the error
>> "knearneigh: data non-numeric".
>>
>
> Which versions of the function actually worked with a
> SpatialPolygonsDataFrame? As far as I can see, this has always failed with
> the same error message; since 2007 x can be an object inheriting from
> SpatialPoints.
>
> The justification is to oblige the user to acknowledge that while point
> support is accepted without question, the change of support from areal to
> point is something the user needs to take responsibility for, for example
> using coordinates() to extract the label point of the largest exterior ring
> in the Polygons object.
>
> Hope this clarifies,
>
> Roger
>
>
>> The code used:
>> knearneigh(gadmsimpl4_poly,k = 4,longlat = FALSE)
>> Error in knearneigh(gadmsimpl4_poly, k = 4, longlat = FALSE) :
>> knearneigh: data non-numeric
>>
>> Any ideas what might be causing this error? I cannot remember seeing this
>> before.
>>
>> Andreas
>>
>> Metadata:
>>
>>> class(gadmsimpl3_poly)
>>>
>> [1] "SpatialPolygonsDataFrame"
>> attr(,"package")
>> [1] "sp"
>>
>>> length(colnames(gadmsimpl3_poly at data))
>>>
>> [1] 84
>>
>>> length(gadmsimpl3_poly)
>>>
>> [1] 1095
>>
>>> gadmsimpl3_poly at bbox
>>>
>>        min      max
>> x -25.36181 50.48654
>> y -34.63487 25.00001
>>
>>> gadmsimpl3_poly at proj4string
>>>
>> CRS arguments:
>> +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0
>>
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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
>

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