# Just Launched: You can now import projects and releases from Google Code onto SourceForge

We are excited to release new functionality to enable a 1-click import from Google Code onto the Allura platform on SourceForge. You can import tickets, wikis, source, releases, and more with a few simple steps.

## vxl-users

 [Vxl-users] How to get eigenvalue and eigenvector of a symmetric matrix From: Fucang Jia - 2003-03-29 05:29:05 Attachments: Message as HTML ```SGkgZXZlcnlvbmUsDQoNCkkgYW0gbmV3IHRvIFZYTCwgSSB3YW50IHRvIGNvbXB1dGUgdGhlIGVp Z2VudmFsdWUgYW5kIGVpZ2VudmVjdG9yIGZyb20gM3gzIEhlc3NpYW4gTWF0cml4LCBidXQgSSBk byBrbm93IGhvdyB0byBjb21wdXRlIHVzaW5nIFZYTCwgY291bGQgeW91IGdpdmUgbWUgc29tZSBl eGFtcGxlIGlsbHVzdHJhdGluZyBob3cgdG8gZG8gdGhpcyBpbiBWWEw/DQoNClRoYW5rcyENCg0K RnVjYW5nDQo= ```
 Re: [Vxl-users] How to get eigenvalue and eigenvector of a symmetric matrix From: Peter Vanroose - 2003-03-29 22:59:23 ```> I am new to VXL, I want to compute the eigenvalue and eigenvector from > 3x3 Hessian Matrix, but I do know how to compute using VXL, could you > give me some example illustrating how to do this in VXL? Did you try using vnl/algo/vnl_symmetric_eigensystem ? Here is an example of use, distilled from vnl/tests/test_symmetric_eigensystem.cxx : #include #include int main() { double Sdata[36] = { 30.0000, -3.4273, 13.9254, 13.7049, -2.4446, 20.2380, -3.4273, 13.7049, -2.4446, 1.3659, 3.6702, -0.2282, 13.9254, -2.4446, 20.2380, 3.6702, -0.2282, 28.6779, 13.7049, 1.3659, 3.6702, 12.5273, -1.6045, 3.9419, -2.4446, 3.6702, -0.2282, -1.6045, 3.9419, 2.5821, 20.2380, -0.2282, 28.6779, 3.9419, 2.5821, 44.0636, }; vnl_matrix S(Sdata, 6,6); vnl_symmetric_eigensystem eig(S); vcl_cout<<"Eigenvalues: "; for (int i=0;i<6;++i) vcl_cout<