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https://issues.apache.org/jira/browse/MATH-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luc Maisonobe resolved MATH-1143.
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Resolution: Fixed
Fix Version/s: 4.0
Methods toDifferentiable (two signatures) and derivative (two signatures) have
been added to FunctionUtils.
Note that the proposal I made in an earlier comment did not work as it does not
handle partial derivatives composition correctly. This means it failed when the
input parameters were not the canonical free parameters of the derivatives. The
committed methods handle composition correctly.
> 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
> Fix For: 4.0
>
>
> 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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