How to improve calculation time of spatial weight matrices on spdep

Hello.

 Currently, among GeoComputaion community in Japan,
GeoDa's calculation speed of  spatial weight matrices of
polygons are highly evaluated.

 Any idea to improve this of spdep?

Further to my previous message, the next release of spdep will have time 
savings like from 1000 seconds reduced to 300 seconds on a 3500 polygon 
data set. Thanks for pointing this out, with Rprof(), it wasn't difficult 
to find a cheap way to economise (only check storage mode once per 
polygon).

Roger

 Regards.

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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.Bivand at nhh.no