Method GetTrace

fem/diffop.hpp:613–619

    { return IntRange(0, fel.GetNDof()); }

    shared_ptr<DifferentialOperator> GetTrace() const override
    {
      if (auto diffoptrace = diffop->GetTrace())      
        return make_shared<SymMatrixDifferentialOperator> (diffoptrace, vdim);
      else
        return nullptr;
    }

    virtual void CheckElement (const FiniteElement& bfel) const override;