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From "lujing.zui (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAMA-882) errors in eigenValues and eigenVectors wiki page
Date Sun, 02 Mar 2014 14:05:20 GMT
lujing.zui created HAMA-882:
-------------------------------

             Summary: errors in eigenValues and eigenVectors wiki page 
                 Key: HAMA-882
                 URL: https://issues.apache.org/jira/browse/HAMA-882
             Project: Hama
          Issue Type: Documentation
          Components: documentation 
            Reporter: lujing.zui
            Priority: Trivial


In "EigenValues and EigenVectors" wiki page.
step 3 in methods
"each rotation just effects 4 elements of the matrix".
this is error. actully echo rotation effects two rows and two cols, matirx is symmetric, so
effects two rows.
4 elements is totally WRONG.

and the pseudocode described below, it's confusing.

c,s computed as this which is not metioned.
c = cos(\theta)
s = sin(\theta)

someone can improve this page, despite i know the JacobiEigenValue removed in the repo?



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