On 1/31/22 11:41, Ali Seddiq wrote:
Thanks for a quick reply, and sorry for ambiguity. To be more precise
(trying to be) I should say the lines I modified with the aim of
creating a so-called "view" do not do that for my intended variable. My
question mainly was that if using the [ ] operator (that I added) does
the job of identifying the desired field on the faces? Is the usage correct?
Yes. The call in your example code considers the first vector component
of the i'th shape function at quadrature point q_point.
I am also a bit confused as fe.system_to_component_index
<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dealii.org%2Fcurrent%2Fdoxygen%2Fdeal.II%2FclassFiniteElement.html%23a86644fe67824373cd51e9ff7fca94f8c&data=04%7C01%7CWolfgang.Bangerth%40colostate.edu%7C66a9d6d095e7444d971c08d9e4e94b94%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637792512914352482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=%2BiFE%2FIimkawMXkp54Z7Kci%2BA7AYn%2B6EJg%2BFeTE5LVYQ%3D&reserved=0>(i)
seems to do the same but not for the faces I guess. So not sure which
approach should be taken.
system_to_component index is a property of the finite element, not of
the FEValues or FEFaceValues class. As such, it can be used as well.
step-8 shows how it is used for FEValues, but the same could be done for
FEFaceValues.
Best
W.
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