Dear Kyusik,

I gather that what you are trying to implement here is the equation that 
you present in this post 
<https://groups.google.com/d/msg/dealii/7NaagkXrevs/YAMg3QPBAgAJ>. I concur 
with Bruno's assessment of the problem - unfortunately your implementation 
is incorrect (compare what you've written as contributions to the cell_rhs 
to the equation you listed), so you probably want to think a little more 
carefully about what you're doing here.

Regards,
Jean-Paul

On Friday, May 19, 2017 at 2:33:18 PM UTC+2, Bruno Turcksin wrote:
>
> Kyusik,
>
> On Friday, May 19, 2017 at 8:27:39 AM UTC-4, hanks0...@gmail.com wrote:
>>
>>
>>   std::vector<Tensor<1,dim> > sol_grad(n_q_points);
>>
>  
>
>>             cell_rhs(i) += fe_values2.shape_value(i,q_index) *
>>                             sol_grad[q_index] *(F/p(0)/grad_sol_sq)*
>>                             fe_values2.JxW(q_index);
>>
>  
>
>> /user2/hanks318/dealii/dealii_pre/examples/step-6/step-6.cc:665: error: 
>> no match for ‘operator+=’ in ‘cell_rhs.dealii::Vector<number>::operator() 
>> [with Number = double](i) += dealii::operator*(const dealii::Tensor<1, dim, 
>> double>&, double) [with int dim = 2](fe_values2.dealii::FEValues<2, 
>> 2>::<anonymous>.dealii::FEValuesBase<dim, spacedim>::JxW [with int dim = 2, 
>> int spacedim = 2](q_index))’
>>
> sol_grad[q_index] is a Tensor<1,dim,double> so it has dim components. You 
> cannot add it to a double.
>
> Best,
>
> Bruno
>

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