[R] Warning messages in Splancs package :: no non-missing arguments to min; returning Inf
eloquence2 at gmail.com
Mon Mar 30 10:06:54 CEST 2009
I am new to R and I am sorry for the sens information. I am using R
2.8.1 for Windows.
Does the error come from the kernel2d function, or from the image function?
-- It comes from the kernel2d function.
Does it do that for any data points?
-- Not yet tried with other data, only two mentioned Shapefiles. They
are correctly structured.
Have you read the help for kernel2d? Have you tried the example in the
-- I will look into it, thanks!
Have you ever had it work?
-- No, tries on two separate installations.
Thanks for the solution, I will test it right away.
On Mon, Mar 30, 2009 at 09:43, Barry Rowlingson
<b.rowlingson at lancaster.ac.uk> wrote:
> On Mon, Mar 30, 2009 at 7:12 AM, D <eloquence2 at gmail.com> wrote:
>> I would need some help with the splans package in R.
>> I am using a Shapefile (downloadable at)
>> and the following execution code
>> setwd("C:\\Documents and
>> auto.spp<-as.points(auto_xy$x/1000, auto_xy$y/1000)
>> rob.spp<-as.points(rob_xy$x/1000, rob_xy$y/1000)
>> image(kernel2d(auto.spp, bbox(auto.spp), h0=4, nx=100, ny=100),
>> pointmap(auto.spp, col="red", add=TRUE)
>> I would need to analyze the relationship betweeb the two Shapefiles,
>> but I am receiving the following warning message and a blank output
>> Xrange is 1827.026 6796.202
>> Yrange is 1853.896 6832.343
>> Doing quartic kernel
>> Warning messages:
>> 1: In min(x) : no non-missing arguments to min; returning Inf
>> 2: In max(x) : no non-missing arguments to max; returning -Inf
>> Can someone help me with what am I doing wrong in the execution code?
>> I am getting a blank graph.
> Well, do some investigation. Does the error come from the kernel2d
> function, or from the image function? Does it do that for any data
> points? Have you read the help for kernel2d? Have you tried the
> example in the help(kernel2d) text? Have you ever had it work? What
> version of R are you using and so on. Please read the posting guide.
> The manual for kernel2d says that the second argument has to be "A
> splancs polygon data set". But you've given it bbox(auto.spp). But
> bbox returns a matrix which is the wrong structure - the columns are
> min and max and the rows are X and Y. Plus it only has the corner
> points, not all four points of the box which splancs says it needs.
> There's also a clue in your output:
> Xrange is 1827.026 6796.202
> Yrange is 1853.896 6832.343
> - but if you plot the points (which you should always do, to make
> sure you've read them in properly) you should see that the X range
> should be 6796 to 6832 and the Y range should be 1827 to 1853.
> Solution: use the splancs bboxx() function that converts an sp-style
> bounding box to a splancs-style bounding box:
> k = kernel2d(auto.spp, bboxx(bbox(auto.spp)), h0=4, nx=100, ny=100)
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