I/O from XDMF/HDF5 files in dolfin-x

[dokken]

@MK3

This happens for both the real and complex build and it does not happen in stable.

This is because you are writing out a P-2 field on a P-1 grid.
In 0.6.0 XDMFFile implicitly interpolated into P-1.
This has been removed in later versions, and the user has to interpolate the function into an appropriate function space for usage with xdmf (P-1 in your case).

@MK3

Thank you, this helped me realize at least the part of the issue. It works for the real build, also in Jupyterlab, but it doesn’t work for the complex one. Also not if I reproduce your approach.

I would have to adapt the source code of adios4dolfinx to work with complex-valued functions. Ive made an issue: Complex valued support · Issue #30 · jorgensd/adios4dolfinx · GitHub