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From |
Matthew J Baker <matthew.baker@hunter.cuny.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Mata not computing eigenvectors/values |

Date |
Sun, 9 Jan 2011 21:22:19 -0500 (EST) |

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: owner-statalist@hsphsun2.harvard.edu (on behalf of Zachary Neal <zpneal@gmail.com>) >Subject: st: Mata not computing eigenvectors/values >To: statalist@hsphsun2.harvard.edu > >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 >* >* For searches and help try: >* http://www.stata.com/help.cgi?search >* http://www.stata.com/support/statalist/faq >* http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Mata not computing eigenvectors/values***From:*Steven Samuels <sjsamuels@gmail.com>

**References**:**st: Mata not computing eigenvectors/values***From:*Zachary Neal <zpneal@gmail.com>

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