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https://issues.apache.org/jira/browse/MATH-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14521051#comment-14521051
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Alexander Nozik commented on MATH-1143:
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This is exactly what i wat talking about. Also the same thing should be done
for MultivariateDifferentiableFunction.
Another thing that perhaps is not so easy to do is to create some way to define
new derivative structures without using FiniteDifferencesDifferentiator. For
example I've got some compex function for which I know its value in any point
and all its first order derivatives in any point, but can't provide any
analytical expression for it (in my case the function is obtained by
integrating some other function). Now I want to work with this function and its
derivatives. How can I do that?
> Helper methods to FiniteDifferencesDifferentiator
> -------------------------------------------------
>
> Key: MATH-1143
> URL: https://issues.apache.org/jira/browse/MATH-1143
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Alexander Nozik
> Priority: Trivial
>
> A DerivativeStructure and UnivariateDifferentiableFunction are great tools if
> one needs to investigate the whole function but are not convenient if one
> just needs derivative in a given point.
> Perhaps you could add some helper methods to FiniteDifferencesDifferentiator
> or to utility class like FunctionUtils. Also it would be good to have helper
> methods to get the derivatives of UnivariateDifferentiableFunction or
> MultivariateDifferentiableFunction as simple Univariate or Multivariate
> functions (or vector-functions).
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