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https://issues.apache.org/jira/browse/MATH-1389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15562763#comment-15562763
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Gilles commented on MATH-1389:
------------------------------
Customizing the code with additional knowledge (data layout) is an obvious use
of method override.
If the patch enhances performance in some use-case and has no drawback, it
should be applied.
> Runtime Improvement for getSubMatrix in Array2DRowRealMatrix
> ------------------------------------------------------------
>
> Key: MATH-1389
> URL: https://issues.apache.org/jira/browse/MATH-1389
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Christoph Dibak
> Priority: Trivial
> Attachments: 0001-faster-getSubMatrix-for-Array2DRowRealMatrix.patch,
> MatrixBenchmark.java, RuntimeTestGetSubMatrix.java
>
>
> Using System.arraycopy() for creating sub-matrices in the getSubMatrix()
> method of Array2DRowRealMatrix improves the runtime. Tested for a matrix
> with dimension 50x50, the execution time was 16 times faster.
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