Optimisation for QRDecomposition, BiDiagonalTransformer and
TriDiagonalTransformer
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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
Priority: Minor
Fix For: 3.0, Nightly Builds
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 check is not necessary
if the calling method has already ensured them to be in bounds, for example by
checking the max and min index as a looping parameter.
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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