On Thu, 19 Aug 2010, Lata Rafael wrote:
Dear all,
I have a problem converting a large binary sparse weight matrix (62025 *
62025) of class dgT to listw
You mean in package Matrix, and as described in ?"TsparseMatrix-class"?
Is there a function that creates a listw object from a sparse matrix?
From the description, you should be able to work out how to convert such
an object into a "spatial.neighbours" object (see listw2sn), then use
sn2listw() to go the other way. Watch the attributes, as they need to be
correct. Also note that the input object uses 0-base indices, but the sn
object uses 1-base indices.
Hope this helps,
Roger
Thank you in advance.
Best regards
Rafael Lata
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Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: roger.biv...@nhh.no
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