Daniel,
Sorry I meant to say I don't want to use that chain rule.
It's because I am looking at papers that compare integrating both versions
of the weak form:
post and prior using the chain rule.
Abbas
On Tuesday, January 23, 2024 at 7:47:14 PM UTC d.arnd...@gmail.com wrote:
> Abbas,
>
> \dfrac{\partial f(x) \phi_i}{\partial x} is just \dfrac{\partial
> f(x)}{\partial x} \phi_i+f(x)\dfrac{f(x)}{\partial x} which I would use.
> There is no need to integrate by parts.
>
> Best,
> Daniel
>
> On Tue, Jan 23, 2024 at 2:37 PM Abbas Ballout <abbas.b...@gmail.com>
> wrote:
>
>> I know I can query the standard shape gradient at a quadrature point
>> with fe_values.shape_grad(i, q).
>> Is it possible to query for something like the gradient of the shape
>> function multiplied by another function? I need \dfrac{\partial f(x)
>> \phi_i}{\partial x} but I don't want to integrate by parts.
>>
>> Abbas
>>
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