Replace "LUDecompostionImpl" with "QRDecompositionImpl" in
"AbstractLeastSquaresOptimizer"
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Key: MATH-664
URL: https://issues.apache.org/jira/browse/MATH-664
Project: Commons Math
Issue Type: Improvement
Reporter: Gilles
Assignee: Gilles
Priority: Minor
Fix For: 3.0
In some cases, the "getCovariances()" method throws a
"SingularMatrixException". This can be avoided by using "QR" instead of "LU"
decomposition.
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