function for eigendecomposition

[jiaxun hou]

Hello,
   
  Can you tell me which function can compute the eigenvectors for me? I have only found the function "KSPComputeEigenvalues" in the document, but it is not suitable for me. I want to get both the eigenvalues and eigenvectors. And I am looking for a efficient function to do the eigendecomposition for a symmetric matrix. Any help will be appreciated.
   
  Regards,
  Jiaxun

 		
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