Method Diff

fem/coefficient.cpp:2869–2874

  }

  shared_ptr<CoefficientFunction> Diff (const CoefficientFunction * var,
                                          shared_ptr<CoefficientFunction> dir) const override
  {
    if (this == var) return dir;
    return 2*InnerProduct(c1->Diff(var,dir),c1);
  }

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