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Re: st: Mata not computing eigenvectors/values
From
Steven Samuels <[email protected]>
To
[email protected]
Subject
Re: st: Mata not computing eigenvectors/values
Date
Mon, 10 Jan 2011 10:15:07 -0500
-
Zachary's code works for me if I substitute "A" for "network" in the -
symeigensytem()- command:
symeigensystem(A,eigenvector,eigenvalue)
Steve
Stata 11,1 OS X 10.5.8
On Jan 9, 2011, at 9:22 PM, Matthew J Baker wrote:
While I am not sure about why the symeigensystem command isn't
working, the problem might have something to do with the "A" matrix
being rank deficient. In any case, I find that the commands:
eigensystem(A,X=.,L=.)
and
lefteigensystem(A,Y=.,M=.)
both generate values for eigenvalues and eigenvectors for the
aforementioned A matrix (collected in X and L, and Y and M,
respectively).
Matt Baker
---- Original message ----
Date: Sun, 9 Jan 2011 17:45:19 -0500
From: [email protected] (on behalf of Zachary
Neal <[email protected]>)
Subject: st: Mata not computing eigenvectors/values
To: [email protected]
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
[email protected]
http://www.msu.edu/~zpneal
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