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https://issues.apache.org/jira/browse/MATH-1389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15562975#comment-15562975
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Emmanuel Bourg commented on MATH-1389:
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I think it's worth applying too, optimizing the cold scenario is interesting
and it seems slightly better even when the JIT kicked in.
> 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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