Method Diff

fem/coefficient.cpp:2461–2466

  }

  shared_ptr<CoefficientFunction> Diff (const CoefficientFunction * var,
                                        shared_ptr<CoefficientFunction> dir) const override
  {
      if (this == var) return dir;
      return InnerProduct(c1->Diff(var,dir),c2) + InnerProduct(c1,c2->Diff(var,dir));
  }

  shared_ptr<CoefficientFunction> DiffJacobi (const CoefficientFunction * var, T_DJC & cache) const override
  {