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https://issues.apache.org/jira/browse/MATH-612?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Phil Steitz resolved MATH-612.
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Resolution: Fixed
Patches applied in r1183504,1183505,1183507
Thanks for the patches!
> Optimisation for QRDecomposition, BiDiagonalTransformer and
> TriDiagonalTransformer
> ----------------------------------------------------------------------------------
>
> Key: MATH-612
> URL: https://issues.apache.org/jira/browse/MATH-612
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 3.0, Nightly Builds
> Reporter: Christopher Nix
> Assignee: Phil Steitz
> Priority: Minor
> Labels: patch
> Fix For: 3.0, Nightly Builds
>
> Attachments: BiDiagonalTransformer.patch, QRDecompositionImpl.patch,
> TriDiagonalTransformer.patch
>
>
> QRDecomposition, BiDiagonalTransformer and TriDiagonalTransformer all contain
> methods that create an empty matrix for population in calculations employing
> getEntry and setEntry on the matrix. Methods getEntry and setEntry perform a
> check to ensure the matrix indices are in bounds. This overhead of method
> calls is detrimental within loops that iterate many times.
> Methods within QRDecomposition, BiDiagonalTransformer and
> TriDiagonalTransformer have significantly improved performance over large
> matrices if, instead of creating an empty RealMatrix and then using getEntry
> and setEntry, we create a double array for direct access and create a
> RealMatrix from it at the end.
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