Got it. Thank you Daniel.

Best,
Jiaqi

2016-09-16 4:57 GMT-04:00 Daniel Arndt <d.ar...@math.uni-goettingen.de>:

> Jiaqi,
>
> Currently you can access first, second and third partial derivatives in
> FEValues. The FiniteElement class also implements fourth derivatives.
> If this is sufficient for your purposes, then using
> FEValues*::third_derivative should be fine for you. I don't see a easier
> way at the moment.
>
> Best,
> Daniel
>
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-- 
Jiaqi Zhang
Graduate student
Department of Mathematics
Virginia Tech

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