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 know I documented this somewhere (maybe in FEValues::gradient() or
FEValuesView::Vector::gradient) but if you can't find it, it would be nice if
you could just try out and maybe suggest a place where this should be documented.
Best
W.
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Wolfgang Bangerth email: [email protected]
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