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WIP: Feature/discreteglobalbasisfunction derivative

Max Kahnt requested to merge max.kahnt/dune-functions:feature/discreteglobalbasisfunction-derivative into master

Mainly extends DiscreteGlobalBasisFunction by derivative functionality. This contains (and in its current state requires) !186 (merged). This is an alternative approach to !57 (closed).

Has:

  • This allows for localFunction(derivative(aDBGF)) as well as derivative(localFunction(aDGBF))
  • This assumes that the NodeToRangeEntry can be used for the Jacobians as well.
  • The necessary specializations to make the existing discreteglobalbasisfunctiontest compile.
  • Provides wrap_own_share which is an unmarked copy of code introduced by @carsten.graeser elsewhere.

Lacks:

  • I have not considered interactions with DifferentiableFunction
  • I have not written any dedicated test (unlike !57 (closed)).
Edited by Simon Praetorius

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