DOLFIN User Manual - FEniCS Project

DOLFIN User ManualHoffman, Jansson, Logg, Wells◮ Developer’s note: Some of the file formats are partly broken after changingthe linear algebra backend to PETSc. (Do grep FIXME in src/kernel/io/.)Format Vector Matrix Mesh Function SampleFile::xml in/out in/out in/out — —File::vtk — — out out —File::opendx — — out out —File::octave out out out out outFile::matlab out out out out outFile::tecplot — — out out —File::gid — — out out —Table 9.2: Matrix of supported combinations of classes and file formats forinput/output in DOLFIN.9.2 File formatsIn this section, we give some pointers to each of the file formats supported byDOLFIN. For detailed information, we refer to the respective user manualof each format/program.◮ Developer’s note: This section needs to be improved and expanded. Anycontributions are welcome.9.2.1 DOLFIN XMLDOLFIN XML is the native format of DOLFIN. As the name says, datais stored in XML ASCII format. This has the advantage of being a robustand human-readable format, and if the files are compressed there is littleoverhead in terms of file size compared to a binary format.DOLFIN automatically handles gzipped XML files, as illustrated by the followingexample which reads a Mesh from a compressed DOLFIN XML fileand saves the mesh to an uncompressed DOLFIN XML file:59