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https://issues.apache.org/jira/browse/MATH-1004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13793067#comment-13793067
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Thomas Neidhart commented on MATH-1004:
---------------------------------------

DiagonalMatrix already has a few additional public method, e.g. 
add(DiagonalMatrix), so it would probably also be ok to add a inverse() method 
to the class itself.

Any opinions on this topic?

Imho, I would prefer adding it as MatrixUtils.inverse(DiagonalMatrix).

> Inversion of diagonal matrix
> ----------------------------
>
>                 Key: MATH-1004
>                 URL: https://issues.apache.org/jira/browse/MATH-1004
>             Project: Commons Math
>          Issue Type: New Feature
>            Reporter: Ajo Fod
>            Priority: Minor
>         Attachments: MATH-1004.patch
>
>
> This should be a very easy feature to add and has many applications. 



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