Demo not found

[Enrico Borinato]

Hi everyone,

I know that exist a FEniCS demo where the Poisson equation is solved with the discontinuous Galerkin elements. In internet I found different post related to this demo which should be dg_poisson.py but the github page doesn't exist (404 server not found).

Anyone can share this script? Because I'm having trouble in solving the heat equation whit the DG elements. I can't apply the boundary condition to my system and I don't understand why and maybe in that demo I can find how to do it.

Any help is much appreciated.

Thanks in advance.

[Johannes Ring]

Hi,

The demo can be found here: https://bitbucket.org/fenics-project/dolfin/src/master/python/demo/undocumented/dg-poisson/demo_dg-poisson.py

If you have questions, please use the FEniCS discourse site: https://fenicsproject.discourse.group

Johannes

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[Enrico Borinato]

Thank you so much for helping.

I read all the discussions and the codes.

I managed to implement the BC both in strong form and in weak form.

Unfortunately this is not enough because I could't solve my problem.

Do you know any way to modify manually the stiffness matrix? Because when I try to do it  an error occurs (TypeError: 'dolfin.cpp.la.Matrix' object does not support item assignment)