Saving an xdmf file - dolfinx v 0.7.0

[dokken]

Please search for error messages on the forum prior to posting questions that have already been answered.
See:

Linear Elasticity Tutorial w/ Quadratic Tetrahedrals

Use dolfinx.io.VTXWriter instead of xdmffile if you are not using isoparametric elements.

TypeError: BoundingBoxTree.__init__() takes 2 positional arguments but 3 were given

Meshtags now require the geometry as second input The decision of having to explicitly interpolate into a supported XDMF-file function space (will be a continuous lagrange space of same order as the mesh geometry) was made to highlight that this makes a loss of accuracy and can be an expensive operation. If you are using higher order Lagrange/DG elements, you should use VTKFile or VTXWriter, as they support this kind of output. If you are using other spaces, such as RT, Nedelec etc, they sho…

or for the tutorial up to date with the main branch see

GitHub - jorgensd/dolfinx-tutorial: A reimplementation of the Springer book:...