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Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2012/12/03 11:41:59 UTC

[jira] [Created] (MATH-911) Remove usage of "DerivativeStructure" in the "optimization" package

Gilles created MATH-911:
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             Summary: Remove usage of "DerivativeStructure" in the "optimization" package
                 Key: MATH-911
                 URL: https://issues.apache.org/jira/browse/MATH-911
             Project: Commons Math
          Issue Type: Task
            Reporter: Gilles
            Priority: Minor
             Fix For: 3.1


The "DerivativeStructure" class is not the proper interface towards user applications that deal with optimization problems.

Recent changes implies copying between e.g. the user's representation of a Jacobian and the "DerviativeStructure" representation of the same data. And, actually, the current implementation of "AbstractLeastSquaresOptimizer" copies back the "DerviativeStructure" representation into a "double[][]" for internal use.

[~kberlin] pointed out the potential storage inefficiencies in large-scale problems.


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