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From "Alexander Nozik (JIRA)" <>
Subject [jira] [Commented] (MATH-1143) Helper methods to FiniteDifferencesDifferentiator
Date Thu, 30 Apr 2015 07:21:06 GMT


Alexander Nozik commented on MATH-1143:

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:
>             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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