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https://issues.apache.org/jira/browse/MATH-564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026331#comment-13026331
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Phil Steitz commented on MATH-564:
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+1 to add this
> add a double[][] solve(double[][]) method to Decompositionsolver
> ----------------------------------------------------------------
>
> Key: MATH-564
> URL: https://issues.apache.org/jira/browse/MATH-564
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 2.2
> Reporter: Luc Maisonobe
> Assignee: Luc Maisonobe
> Priority: Trivial
> Fix For: 3.0
>
>
> The decomposition solver provides both RealVector and double[] types for
> vector solving, but it provides only RealMatrix type for matriw solving.
> This breaks symmetry and is inconvenient in some algorithms which perform
> lots of iterations. Lots of copying occurs while converting back and forth
> between RealMatrix and arrays, with no value added when the matrix aspect of
> the data is only used in the solve operation.
> Adding a double[][] counterpart to RealMatrix in decomposition is also
> trivial as internally the various implementations already use that.
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