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
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--
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.biv...@nhh.no
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