Unreadable mesh files in dolfin repository

[Martin Sandve Alnæs]

Looking at <dolfin trunk>/data/meshes/, there are meshes that cannot be loaded by dolfin because the tag meshfunction has been changed to mesh_function, see example with cylinder.xml.gz below. Has the mesh file format been deliberately made incompatible for such a small estethic issue? Seems like a bad idea to break compatibility like this. Is there a way to update mesh files to the new format? dolfin-convert doesnt seem to do the job.

In [1]: from dolfin import *

In [2]: mesh = Mesh("cylinder.xml.gz")
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
<ipython-input-2-2b33cf4c68b9> in <module>()
----> 1 mesh = Mesh("cylinder.xml.gz")

/home/martinal/opt/fenics/dorsal-unstable/lib/python2.7/site-packages/dolfin/mesh/meshes.pyc in __init__(self, *args, **kwargs)
     91
     92 # Initialize base class
---> 93 cpp.Mesh.__cppinit__(self, *args, **kwargs)
     94
     95 # Change mesh constructor

/home/martinal/opt/fenics/dorsal-unstable/lib/python2.7/site-packages/dolfin/cpp/mesh.pyc in __init__(self, *args)
   1840
   1841 """
-> 1842 _mesh.Mesh_swiginit(self,_mesh.new_Mesh(*args))
   1843 __swig_destroy__ = _mesh.delete_Mesh
   1844 def num_vertices(self, *args):

RuntimeError:

*** -------------------------------------------------------------------------
*** DOLFIN encountered an error. If you are not able to resolve this issue
*** using the information listed below, you can ask for help at
***
*** https://answers.launchpad.net/dolfin
***
*** Remember to include the error message listed below and, if possible,
*** include a *minimal* running example to reproduce the error.
***
*** -------------------------------------------------------------------------
*** Error: Unable to read mesh data from XML file.
*** Reason: The XML tag <meshfunction> has been changed to <mesh_function>.
*** Where: This error was encountered inside XMLMesh.cpp.
*** Process: 0
*** -------------------------------------------------------------------------

[Martin Sandve Alnæs (martinal)]

The only affected meshes from data/meshes/ were cylinder.xml.gz and rotator.xml.gz. I fixed those.

[Anders Logg (logg)]

On Thu, Jan 03, 2013 at 04:04:52PM -0000, Martin Sandve Alnæs wrote:
> The only affected meshes from data/meshes/ were cylinder.xml.gz and
> rotator.xml.gz. I fixed those.

Thanks. The change in syntax was made a long time ago for
consistency. I think it's been at least 2 years.

--
Anders

[Garth Wells (garth-wells)]

We should have unit tests for the meshes in data/

Garth

On Thu, Jan 3, 2013 at 4:04 PM, Martin Sandve Alnæs
<email address hidden> wrote:
> The only affected meshes from data/meshes/ were cylinder.xml.gz and
> rotator.xml.gz. I fixed those.
>
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> Title:
> Unreadable mesh files in dolfin repository
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