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st: Mata not computing eigenvectors/values


From   Zachary Neal <zpneal@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Mata not computing eigenvectors/values
Date   Sun, 9 Jan 2011 17:45:19 -0500

Running the commands below, mata does not yield any eigenvectors or
eigenvalues.  Computing eigenvectors/values in stata using matrix
symeigen seems to work without a problem.  Any help would be
appreciated.

mata
A = (0,0,0,0,0,1,0,1,0,0,0,0,0 \ ///
     0,0,0,0,0,0,0,1,0,1,0,0,0 \ ///
     0,0,0,1,0,1,1,0,1,0,1,1,1 \ ///
     0,0,1,0,0,0,1,0,0,0,0,0,0 \ ///
     0,0,0,0,0,0,0,1,0,0,0,0,0 \ ///
     1,0,1,0,0,0,0,0,0,0,0,1,0 \ ///
     0,0,1,1,0,0,0,0,0,0,0,0,0 \ ///
     1,1,0,0,1,0,0,0,0,0,0,0,0 \ ///
     0,0,1,0,0,0,0,0,0,0,0,0,0 \ ///
     0,1,0,0,0,0,0,0,0,0,0,0,0 \ ///
     0,0,1,0,0,0,0,0,0,0,0,0,0 \ ///
     0,0,1,0,0,1,0,0,0,0,0,0,0 \ ///
     0,0,1,0,0,0,0,0,0,0,0,0,0)
eigenvector = 0
eigenvalue = 0
symeigensystem(network,eigenvector,eigenvalue)
eigenvector
eigenvalue
end

-- 
Zachary Neal, PhD
Department of Sociology
Michigan State University
zpneal@msu.edu
http://www.msu.edu/~zpneal
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