Hi Gisselle, This error message occurs when you use a very old (probably GCC 4.8 or 4.9) C++ compiler with a version of deal.II built with a newer C++ compiler (or vice versa). A sure fix is to make sure you use the same compilers both for your code and the library. In practice, though, the ABI change occurred in GCC 5 so combining any two newer versions is typically okay.
Best, David ________________________________ From: dealii@googlegroups.com <dealii@googlegroups.com> on behalf of Giselle Sosa Jones <giselle1...@gmail.com> Sent: Tuesday, May 31, 2022 11:55 AM To: deal.II User Group <dealii@googlegroups.com> Subject: Re: [deal.II] Tensor product polynomials You don't often get email from giselle1...@gmail.com. Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> Hello, I sent this message a while ago and things became clearer for me, but I am still not able to create the spaces that I want. My goal is to create local spaces that look like this: Q_{k-1,k,k} \times Q_{k,k-1,k} \times Q_{k,k,k-1}, for k \geq 1.This is what I am currently doing: - Created my own class of polynomials similar to the deal.II class PolynomialsRaviartThomas, but with the polynomial degrees as described above. - Created my own class (FE_RTProj) for a finite element space similar to the one called FE_DGRaviartThomas. This is a derived class from FE_DGVector and the polynomial type is the one created in the item above. My code does not even compile since I get error messages like: error: undefined reference to 'FE_RTProj::FE_RTProj<2, 2>::get_name[abi:cxx11]() const. The function get_name is defined in the FE_RTProj h and cc files (I basically copied from FE_DGRaviartThomas). I am not sure if this is a C++ issue and/or if there is an easier way of doing this. Any help is highly appreciated! Best, Giselle Sosa Jones On Tuesday, August 31, 2021 at 9:59:55 a.m. UTC-5 Giselle Sosa Jones wrote: Thank you, Dr. Bangerth, I think these extra comments clarify it for me. Best, Giselle On Monday, August 30, 2021 at 8:15:16 p.m. UTC-5 Wolfgang Bangerth wrote: On 8/28/21 4:52 PM, Giselle Sosa Jones wrote: > > I need to create a local space of polynomials in 3D of the form > Q_{k-1,k,k} \times Q_{k,k-1,k} \times Q_{k,k,k-1}. This space is very > similar to the DG Raviart-Thomas space, with the difference that the > polynomial order of each component is one order lower in the > corresponding direction. I was looking at the file > polynomials_raviart_thomas.cc to get an idea of how to create them but I > am a bit lost. Can someone offer a suggestion? Giselle -- can you be specific about which part you have trouble with? I've tried to improve the documentation of the key function of that class a bit: https://github.com/dealii/dealii/pull/12726 Best Wolfgang -- ------------------------------------------------------------------------ Wolfgang Bangerth email: bang...@colostate.edu www: http://www.math.colostate.edu/~bangerth/ -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com<mailto:dealii+unsubscr...@googlegroups.com>. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/f3388a43-fe77-4c01-a346-1a7fb89d243dn%40googlegroups.com<https://groups.google.com/d/msgid/dealii/f3388a43-fe77-4c01-a346-1a7fb89d243dn%40googlegroups.com?utm_medium=email&utm_source=footer>. -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/MN2PR03MB4879589A5424DA0E1259B82DEDDC9%40MN2PR03MB4879.namprd03.prod.outlook.com.
