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Emmanuel Bourg resolved MATH-1389. ---------------------------------- Resolution: Fixed Fix Version/s: 3.7 4.0 I applied the patch on the 4.x and 3.x branches (with a minor optimization for the instantiation of the sub matrix). Thank you very much Christoph! > 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 > Fix For: 4.0, 3.7 > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)