[jira] [Commented] (MATH-883) "getSquareRoot" in "EigenDecomposition"

["Thomas Neidhart (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485592#comment-13485592 ] 

Thomas Neidhart commented on MATH-883:
--------------------------------------

There is a lack of unit tests ;-)
                
> "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.patch
>
>
> 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".

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