Method Diff

fem/coefficient_geo.cpp:463–471

    }

    virtual shared_ptr<CoefficientFunction>
    Diff (const CoefficientFunction * var, shared_ptr<CoefficientFunction> dir) const override
    {
      //d/dt tang|t=0 = dX*tang - ((dX*tang)*tang)*tang
      // if (var == shape.get())
      if (dynamic_cast<const DiffShapeCF*>(var))                
        return dir->Operator("Gradboundary") * const_cast<cl_TangentialVectorCF*>(this)->shared_from_this() - InnerProduct(dir->Operator("Gradboundary")*const_cast<cl_TangentialVectorCF*>(this)->shared_from_this(),const_cast<cl_TangentialVectorCF*>(this)->shared_from_this())*const_cast<cl_TangentialVectorCF*>(this)->shared_from_this();    
      return CoefficientFunctionNoDerivative::Diff(var, dir);
    }
  };