[R] Nearest neighbors of a of 3D points

Eric Leroy |eroy @end|ng |rom |cmpe@cnr@@|r
Wed Feb 6 17:55:37 CET 2019

I tried the spatstat package. In the meanwhile, I think that I found the 
solution: with the pp3 command, I was able to create a pp3 object that 
is recognized by nndist.

I will give a look at the other packages you mentioned seeing what are 
the differences.

Anyway, thank you for your answer.

*Eric Leroy*

/Responsable de la plateforme microscopie électronique/


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Le 06/02/2019 à 17:06, David L Carlson a écrit :
> What have you tried so far? Have you installed the spatstat package and read the manual page for pp3 objects? The website spatstat.org has additional support including a quick reference guide. There are always multiple ways to do something in R, but without more details it is hard to be specific. Nearest neighbor distances are also provided in several other packages, e.g. packages FNN, distances, and RANN.
> ----------------------------------------
> David L Carlson
> Department of Anthropology
> Texas A&M University
> College Station, TX 77843-4352
> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Eric Leroy
> Sent: Wednesday, February 6, 2019 2:37 AM
> To: r-help using r-project.org
> Subject: [R] Nearest neighbors of a of 3D points
> Hi,
> I have a text file that contains the 3D coordinates of points and I want
> to plot the histogram of the nearest neighbors distance. I can import
> the xyz coordinates in R and each value x, y, z is stored in a numerical
> array. I discovered the nndist.pp3 function from the spatstat package
> that seems to do what I want. My problem is to create a pp3 object from
> the xyz values that I have.
> Do you know how to do that ?
> Best regards,

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