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From "Alexander Nozik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1143) Helper methods to FiniteDifferencesDifferentiator
Date Thu, 30 Apr 2015 13:03:06 GMT

    [ https://issues.apache.org/jira/browse/MATH-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14521457#comment-14521457
] 

Alexander Nozik commented on MATH-1143:
---------------------------------------

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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