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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-883) "getSquareRoot" in "EigenDecomposition"
Date Tue, 30 Oct 2012 00:30:12 GMT

    [ https://issues.apache.org/jira/browse/MATH-883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486550#comment-13486550
] 

Gilles commented on MATH-883:
-----------------------------

Code committed in revision 1403590.
                
> "getSquareRoot" in "EigenDecomposition"
> ---------------------------------------
>
>                 Key: MATH-883
>                 URL: https://issues.apache.org/jira/browse/MATH-883
>             Project: Commons Math
>          Issue Type: New Feature
>            Reporter: Gilles
>            Assignee: Gilles
>            Priority: Minor
>              Labels: features
>             Fix For: 3.1
>
>         Attachments: MATH-883.diff
>
>
> I propose to add a method "getSquareRoot" in class "EigenDecomposition" (package "o.a.c.m.linear").
> When assuming that the matrix is symmetric and positive definite, the implementation
is trivial (see ["By diagonalisation"|http://en.wikipedia.org/wiki/Square_root_of_a_matrix]).
> I would also suggest that the ["isSymmetric" method be moved from "EigenDecomposition"
to "MatrixUtils"|MATH-884].

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