Please keep communications on-list unless there is a genuine reason not to.
To answer your question: Yes, you need to convert to ppp format; the nnwhich() function requires its first argument to be of class "ppp". My example showed you how to construct or "estimate" a window if you don't have or know the window a priori.
cheers, Rolf Turner On 16/04/14 01:23, Monaly Mistry wrote:
Hi Rolf, Thank you very much, I just have one other question, do I need to change the data frame into ppp format? I've tried using as.ppp but get the following error message: Error: x,y coords given but no window specified Best, Monaly. On Thu, Apr 3, 2014 at 9:23 PM, Rolf Turner <r.tur...@auckland.ac.nz <mailto:r.tur...@auckland.ac.nz>> wrote: On 04/04/14 01:16, Monaly Mistry wrote: Hi, If I have a data frame of the location of individuals (x and y coordinate), how do I find the 5 nearest neighbours for each individual. The nnwhich() function from the spatstat package will do this for you. E.g.: require(spatstat) # You need to have *installed* spatstat! W <- ripras(ddd) # Where "ddd" is the name of your data frame. X <- ppp(x=ddd[,1],y=ddd[,2],window=W) n5 <- nnwhich(X,k=1:5)
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