[Users] .h5 file issue.

[Roland Haas]

Hello Bilal,

Cactus HDF5 files are quite complex to read correctly, in particular
when mesh refinement is involved.

Most often they are used with VisIt for visualization.

Both Ian Hinder's SimulationTools (Mathematica) and Wolfgang Kastaun's
PostCactus (Python) can read the files and provide simple
visualizations.

Please see:

https://docs.einsteintoolkit.org/et-docs/Analysis_and_post-processing

and

https://simulationtools.org/documentation/english/tutorials/plotting

and

https://github.com/wokast/PyCactus/blob/master/PostCactus/doc/examples/notebooks/pc_example_2d.ipynb

Yours,
Roland

> Dear Users,
> 
> I am trying to open a .h5 file in jupyter-notebook. Please anyone guide me about reading of HDF files.
> 
> *_Command;_*
> 
> 
> import h5py
> filename = "ct_multilevel-err.h5"
> with h5py.File(filename, "r") as f:
>      # List all groups
>      print("Keys: %s" % f.keys())
>      a_group_key = list(f.keys())[0]
> 
>      # Get the data
>      data = list(f[a_group_key])
> 
> *_Error;_*
> 
> IOError                                    Traceback (most recent call last)
> <ipython-input-12-769b4593257a>  in<module>()
> 1  filename=  "ct_multilevel-err.h5"
> ----> 2with  h5py.File(filename,  "r")  as  f:
> 3      # List all groups
> 4      print("Keys: %s"  %  f.keys())
> 5      a_group_key=  list(f.keys())[0]
> 
> /usr/local/lib/python2.7/dist-packages/h5py/_hl/files.pyc  in__init__(self, name, mode, driver, libver, userblock_size, swmr, rdcc_nslots, rdcc_nbytes, rdcc_w0, track_order, **kwds)
> 406                  fid = make_fid(name, mode, userblock_size,
> 407                                 fapl,  fcpl=make_fcpl(track_order=track_order),
> --> 408swmr=swmr) 409  410              if  isinstance(libver,  tuple):
> 
> /usr/local/lib/python2.7/dist-packages/h5py/_hl/files.pyc  inmake_fid(name, mode, userblock_size, fapl, fcpl, swmr)
> 171          if  swmrand  swmr_support:
> 172              flags|=  h5f.ACC_SWMR_READ
> --> 173fid=  h5f.open(name,  flags,  fapl=fapl)
> 174      elif  mode==  'r+':
> 175          fid=  h5f.open(name,  h5f.ACC_RDWR,  fapl=fapl)
> 
> h5py/_objects.pyx  inh5py._objects.with_phil.wrapper()
> 
> h5py/_objects.pyx  inh5py._objects.with_phil.wrapper()
> 
> h5py/h5f.pyx  inh5py.h5f.open()
> 
> *IOError**: Unable to open file (unable to open file: name = 'ct_multilevel-err.h5', errno = 2, error message = 'No such file or directory', flags = 0, o_flags = 0)*
> 


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