Question #103296 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/103296
Status: Open => Answered
Anders Logg proposed the following answer:
On Fri, Mar 05, 2010 at 09:49:29AM -0000, Chris Richardson wrote:
> New question #103296 on DOLFIN:
> https://answers.launchpad.net/dolfin/+question/103296
>
> I want to save output from python to checkpoint my code for reading in later.
> I thought XML was the right way to do this, but I have problems with saving
> XML.
> Firstly, the demo in tensor-weighted-poisson does not work for me -
>
> -snip-
> # Store to file
> mesh_file = File("mesh.xml.gz")
> c00_file = File("c00.xml.gz")
> c01_file = File("c01.xml.gz")
> c11_file = File("c11.xml.gz")
>
> mesh_file << mesh
> c00_file << c00
> c01_file << c01
> c11_file << c11
> -snip-
>
> File "../demo/pde/tensor-weighted-poisson/python/generate_data.py", line
> 38, in <module>
> mesh_file << mesh
> RuntimeError: *** Error: Unable to write XML data, gzipped XML (.xml.gz) not
> supported for output.
We can read input in gzipped XML, but not output (should be fairly
easy to add) so you need to use unzipped XML for output.
> Is there some configuration I am missing???
>
> Secondly, if I try to use uncompressed XML:
>
> T1 = Function(Q)
> tfile_xml = File("r1-t.xml")
> tfile_xml << T1
>
> RuntimeError: *** Error: Unable to write objects of type Function to Unknown
> file type files.
You can't store Functions to file, not any more. We could before but
it was removed since it relied on DOLFIN having a large precompiled
library of elements. Instead, you need to read/write vectors:
file << T1.vector()
file >> T1.vector()
You can also try the TimeSeries class which reads/writes in binary
format which should be much more efficient.
It currently only handles Vectors but will handle Meshes in the future.
--
Anders
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