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https://issues.apache.org/jira/browse/MATH-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14521457#comment-14521457
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Alexander Nozik commented on MATH-1143:
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I do try to use DerivativeStructure in case it is not supposed to cover, but
problem is that it is not always possible to present my function in the form of
primitive operations composition. In my case the function is produced via
numerical integration. For now Commons Math gives only two possibilities: work
without derivatives at all or work with DerivativeStructure. So I am trying to
do the later and not to reinvent the wheel.
> 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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