polygon neighbor matrix
On Mon, 31 Aug 2015, Paul Lantos wrote:
Hi, I'm trying to use the cluster analysis program Flexscan, which I gather is similar to Satscan but it computes irregular clusters. This program requires a polygon adjacency matrix (termed a 'matrix definition file'). The example they provide has a row for every polygon, and for each row every neighboring polygon is listed in successive columns. So for instance if row 1 / polygon 1 has 3 neighbors there will be three polygons listed in columns 2-4. I have tried some techniques like the spatial weights matrix tools in ArcGIS and in Spatstat, but I cannot get the output in this kind of format. Was wondering if there is some obvious way to do this in R. The documentation for Flexscan is here: https://sites.google.com/site/flexscansoftware/download_e/FleXScan%20User%20Guide_e31.pdf?attredirects=0&d=1
Something like:
library(spdep)
example(nc.sids)
out <- sapply(seq(along=ncCR85_nb), function(i) paste(attr(ncCR85_nb,
"region.id")[i], paste(attr(ncCR85_nb, "region.id")[ncCR85_nb[[i]]],
collapse=" ")))
writeLines(out, tf)
file.show(tf)
See also:
vignette("nb")
Roger
Thanks for any help, Paul
_______________________________________ Paul M. Lantos, MD, FIDSA, FAAP, FACP Departments of Internal Medicine and Pediatrics Pediatric Infectious Diseases Hospital Medicine Program Duke University School of Medicine _______________________________________ [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo at r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
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