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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-911) Remove usage of "DerivativeStructure" in the "optimization" package
Date Mon, 03 Dec 2012 10:41:59 GMT
Gilles created MATH-911:
---------------------------

             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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