- Add new port: math/R-cran-numDeriv

  Methods for calculating (usually) accurate numerical first and
  second order derivatives. Accurate calculations are done using
  'Richardson"s' extrapolation or, when applicable, a complex step
  derivative is available. A simple difference method is also provided.
  Simple difference is (usually) less accurate but is much quicker
  than 'Richardson"s' extrapolation and provides a useful cross-check.
  Methods are provided for real scalar and vector valued functions.

  WWW: https://cran.r-project.org/web/packages/numDeriv/

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