adjacency matrix

Dear R experts:

     The purpose of this e-mail is that I want to ask a question about "How
to get adjacency matrix from WINBUGS with ARCVIEW(.shp) files".As I can not
generate the "theme2.txt"  by convert.r .when I run the R project,it show
the problem as follows:

source("convert.s")
convert("theme2")

Read 289 records
Error in if (letter <= "9" & letter >= "0") { : 
        missing value where TRUE/FALSE needed

Would you please give me a help.Thank you!

Best regards

Aijun Yang

The Department of Statistics
The Chinese University of Hongkong
N.T. Hongkong
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