Dear friends,
  I can't find the functions in R to do the following tasks:
1. extract the coordinats of ploygon's center  ;
2. create Dirichlet tessellation and Delaunay triangulation for a set of
points
sp,spdep,tripack,et al, seem not to be able to finish it.
 If u know how to do it, please let me know.
Thanks very much.

-- 
With Kind Regards,

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Zhi Jie,Zhang ,PHD
Tel:86-21-54237149   epistat@gmail.com
Dept. of Epidemiology,school of public health,Fudan University
Address:No. 138 Yi Xue Yuan Road,Shanghai,China
Postcode:200032
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