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, -- *Eric Leroy* /Responsable de la plateforme microscopie ?lectronique/ ICMPE - UMR 7182 - CNRS - UPEC 2/8, rue Henri Dunant 94320 Thiais T?l : 01.49.78.12.09 Fax : 01.49.78.12.03 courriel : eric.leroy at icmpe.cnrs.fr <mailto:eric.leroy at icmpe.cnrs.fr> Page Web : : http://www.icmpe.cnrs.fr [[alternative HTML version deleted]]
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 at r-project.org> On Behalf Of Eric Leroy Sent: Wednesday, February 6, 2019 2:37 AM To: r-help at 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, -- *Eric Leroy* /Responsable de la plateforme microscopie ?lectronique/ ICMPE - UMR 7182 - CNRS - UPEC 2/8, rue Henri Dunant 94320 Thiais T?l : 01.49.78.12.09 Fax : 01.49.78.12.03 courriel : eric.leroy at icmpe.cnrs.fr <mailto:eric.leroy at icmpe.cnrs.fr> Page Web : : http://www.icmpe.cnrs.fr [[alternative HTML version deleted]] ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
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 ?lectronique/ ICMPE - UMR 7182 - CNRS - UPEC 2/8, rue Henri Dunant 94320 Thiais T?l : 01.49.78.12.09 Fax : 01.49.78.12.03 courriel : eric.leroy at icmpe.cnrs.fr <mailto:eric.leroy at icmpe.cnrs.fr> Page Web : : http://www.icmpe.cnrs.fr Le 06/02/2019 ? 17:06, David L Carlson a ?crit?:> 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 at r-project.org> On Behalf Of Eric Leroy > Sent: Wednesday, February 6, 2019 2:37 AM > To: r-help at 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, >