On 9/3/20 1:28 PM, yuesu jin wrote:
  I am working on vector value finite element modeling. I read the pages https://www.dealii.org/current/doxygen/deal.II/group__vector__valued.html <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dealii.org%2Fcurrent%2Fdoxygen%2Fdeal.II%2Fgroup__vector__valued.html&data=02%7C01%7CWolfgang.Bangerth%40colostate.edu%7Cb30f39009c8c49c8fc8108d8503f8631%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637347581059635256&sdata=w%2BABjRZ1fzUdFfCQvw49JwLF7Inl3iEG4XR78VwlgoA%3D&reserved=0> which uses the fe_values.divergence and fe_value.grad, but I cannot find these two member functions in the FEValues\FESystem\FEValueBase categories. Could you give me the documentation page about these two functions?

These functions only exist in FEValuesViews::Vector and FEValuesViews::Tensor. You get that if you have something like

  FEValuesExtractors::Vector velocities(0);
  fe_values[velocities].divergence (...);

step-22 shows how this works in practice.

Best
 W.

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Wolfgang Bangerth          email:                 [email protected]
                           www: http://www.math.colostate.edu/~bangerth/

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