[R-sig-Geo] RE: [R] adjacency matrix

[Luc Anselin]

Another alternative would be to use the "Tools" in GeoDa
(free from http://sal.agecon.uiuc.edu/csiss/geoda.html ).
This creates contiguity and distance based sparse weights
files (in ascii format) directly from point and polygon shape
files. The spdep package contains functions to read and
manipulate these weights files. I'm not familiar with the
format used by WinBUGS, but I doubt it can be very different.
L.


On Wednesday, October 22, 2003, at 09:19 AM, Christophe Declercq wrote:

> Your question is not really clear because:
>
> - I don't know what 'convert.r' do
> - I don't know where 'transf.cgm' is (BTW, 'cgm' is not the usual 
> extension
> for shapefiles which is 'shp'). Check if it is really in your current
> directory.
>
> but, yes, if what you want is to import shapefiles in R, it's easy. 
> Look at
> the 'maptools' package on CRAN (there is also a 'shapefiles' package).
>
> And if you want to build an adjacency matrix for a map of polygons (as 
> I
> guess from the header of you mail), look at the 'spdep' package, too. 
> It is
> then possible to write a text file with your data as a list readable by
> WinBUGS.
>
> (I send a copy of my answer to the the R-SIG-GEO mailing list which 
> can be
> of interest to you).
>
> Hope it helps.
>
> Christophe
> --
> Christophe DECLERCQ, MD
> Observatoire Régional de la Santé Nord-Pas-de-Calais
> 13, rue Faidherbe 59046 LILLE Cedex FRANCE
> Phone +33 3 20 15 49 24
> Fax   +33 3 20 55 92 30
> E-mail c.declercq at orsnpdc.org
>
>
>
>> -----Message d'origine-----
>> De : r-help-bounces at stat.math.ethz.ch
>> [mailto:r-help-bounces at stat.math.ethz.ch]De la part de Orlando 
>> Zacarias
>> Envoyé : mercredi 22 octobre 2003 11:58
>> À : r-help at stat.math.ethz.ch
>> Objet : [R] adjacency matrix
>>
>>
>> Dear R experts,
>> I am new to the list and R software. I need to convert arcview
>> file to Winbugs having R has middle package. Got from friends
>> that it is possible following the steps:
>> 1. Converting arcview shapefile to "cgm clear text file"
>> 2. Downloading "convert.r" to into R
>>     2.1 use source("convert.r")
>>      2.2 convert("filename_cgm") without the extension.
>> But that doesn't work, given the following errors:
>> ----------------------------
>> R : Copyright 2003, The R Development Core Team
>> Version 1.8.0  (2003-10-08)
>> R is free software and comes with ABSOLUTELY NO WARRANTY.
>> You are welcome to redistribute it under certain conditions.
>> Type 'license()' or 'licence()' for distribution details.
>> R is a collaborative project with many contributors.
>> Type 'contributors()' for more information.
>> Type 'demo()' for some demos, 'help()' for on-line help, or
>> 'help.start()' for a HTML browser interface to help.
>> Type 'q()' to quit R.
>> [Previously saved workspace restored]
>>> source("convert.r")
>>> convert("transf")
>> Error in file(file, "r") : unable to open connection
>> In addition: Warning message:
>> cannot open file `transf.cgm'
>>>
>> -----------------------------------
>> Have i done some mistakes?Or i am missing some files?
>> Please assist.
>> Rgs,
>> Orlando.
>>
>>
>>
>> 	[[alternative HTML version deleted]]
>>
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>
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