Re: [deal.II] What is the first and second index of the gradient tensor

2020-09-07 Thread yuesu jin
Dear Dr.Bangerth, I found it just before, it is on the page of FEValuesView ( https://www.dealii.org/current/doxygen/deal.II/classFEValuesViews_1_1Vector.html). Thank you very much! Best regards, Yuesu On Mon, Sep 7, 2020 at 11:00 PM Wolfgang Bangerth wrote: > On 9/7/20 6:21 PM, yuesu jin

Re: [deal.II] What is the first and second index of the gradient tensor

2020-09-07 Thread Wolfgang Bangerth
On 9/7/20 6:21 PM, yuesu jin wrote:   I want to contract the gradient tensor with another vector, such as T_ij*n_j, the gradient tensor is d_j u_i (d is the partial differential operator). I am wondering what is the first index of gradient tensor, i or j? I believe it is T_ij = d_j u_i I

[deal.II] What is the first and second index of the gradient tensor

2020-09-07 Thread yuesu jin
Dear all, I want to contract the gradient tensor with another vector, such as T_ij*n_j, the gradient tensor is d_j u_i (d is the partial differential operator). I am wondering what is the first index of gradient tensor, i or j? Thank you ! Best regards, Yuesu -- Yuesu Jin, Ph.D student,