load hdf5

[Alejandro Stewart]

 Hi all, I have been trying to reach model or results from hdf files without succes.  I dont really know if my approach is right. For the bdf it fails  and for the op2 nothing is loaded.

code:

from pyNastran.bdf.bdf import BDF
from pyNastran.op2.op2 import OP2
from pyNastran.bdf.bdf_interface.hdf5_loader import load_bdf_from_hdf5_file
import h5py as h5
bdf=BDF()
op2=OP2()
f = h5.File('placa.h5', 'r')
bdf.load_hdf5_filename('placa.h5')# this neves works
op2.load_hdf5_filename('placa.h5')# nothing is retrieved here
op2.load_hdf5_file(f) # try from another angle....
op2.write_f06('test.f06') #have I read something?

output:

WARNING: hdf5_loader.py:225           skipping hdf5 load for INDEX

WARNING: hdf5_loader.py:225           skipping hdf5 load for NASTRAN

Traceback (most recent call last):

  File "G:/WORK_ALEJANDRO/32.Antesala-NEO/Virtual_CentOs/compartido/test_hdf5/read_hdf_bdf.py", line 8, in <module>

    bdf.load_hdf5_filename('placa.h5')

  File "G:\WORK_ALEJANDRO\32.Antesala-NEO\Virtual_CentOs\compartido\test_hdf5\pyNastran\bdf\bdf.py", line 958, in load_hdf5_filename

    self.load_hdf5_file(hdf5_file)

  File "G:\WORK_ALEJANDRO\32.Antesala-NEO\Virtual_CentOs\compartido\test_hdf5\pyNastran\bdf\bdf.py", line 973, in load_hdf5_file

    load_bdf_from_hdf5_file(h5_file, self)

  File "G:\WORK_ALEJANDRO\32.Antesala-NEO\Virtual_CentOs\compartido\test_hdf5\pyNastran\bdf\bdf_interface\hdf5_loader.py", line 228, in load_bdf_from_hdf5_file

    cards_to_read = _cast(h5_file['cards_to_read'])

  File "h5py\_objects.pyx", line 54, in h5py._objects.with_phil.wrapper

  File "h5py\_objects.pyx", line 55, in h5py._objects.with_phil.wrapper

  File "C:\ProgramData\Anaconda3\lib\site-packages\h5py\_hl\group.py", line 264, in __getitem__

    oid = h5o.open(self.id, self._e(name), lapl=self._lapl)

  File "h5py\_objects.pyx", line 54, in h5py._objects.with_phil.wrapper

  File "h5py\_objects.pyx", line 55, in h5py._objects.with_phil.wrapper

  File "h5py\h5o.pyx", line 190, in h5py.h5o.open

KeyError: "Unable to open object (object 'cards_to_read' doesn't exist)"

Process finished with exit code 1

This bothers me a lot as it sees to skip the h5 info and looks for cards_to_read which isn´t in the hdf5 file:

Model and h5 file are attached.

Alejandro

[Alejandro Stewart]

Content of the h5:

[Alejandro Stewart]

[Alejandro Stewart]

Sorry, the first traceback was after I commented a raise  statement. for the current code I get the following  :

Traceback (most recent call last):

  File "G:/WORK_ALEJANDRO/32.Antesala-NEO/Virtual_CentOs/compartido/test_hdf5/read_hdf_bdf.py", line 8, in <module>

    bdf.load_hdf5_filename('placa.h5')

  File "G:\WORK_ALEJANDRO\32.Antesala-NEO\Virtual_CentOs\compartido\test_hdf5\pyNastran\bdf\bdf.py", line 958, in load_hdf5_filename

    self.load_hdf5_file(hdf5_file)

  File "G:\WORK_ALEJANDRO\32.Antesala-NEO\Virtual_CentOs\compartido\test_hdf5\pyNastran\bdf\bdf.py", line 973, in load_hdf5_file

    load_bdf_from_hdf5_file(h5_file, self)

  File "G:\WORK_ALEJANDRO\32.Antesala-NEO\Virtual_CentOs\compartido\test_hdf5\pyNastran\bdf\bdf_interface\hdf5_loader.py", line 226, in load_bdf_from_hdf5_file

WARNING: hdf5_loader.py:225           skipping hdf5 load for INDEX

    raise RuntimeError('skipping hdf5 load for %s' % key)

RuntimeError: skipping hdf5 load for INDEX

[Steven Doyle]

Alejandro,

The HDF5 format that is supported is that which is written out by pyNastran, not by MSC.  It's an alternative to pickle.  The MSC format is planned for the future, but hasn't been started.

You save it using:

model.export_hdf5_filename(hdf5_filename)

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[Alejandro Stewart]

Thank you Steve.

[Jacoues]

Hi Steve, Are the hdf5 files from MSC now supported? Thank you,

[Steven Doyle]

If you’re just interested in modes, you can use paraview to read the h5 file using pyNastran.dev.h5.h5_nastran_paraview and hack the main function for your file.

Beyond that, no.  It’s in work, but it’s a radical change.  Faster code, but totally different structure.  It had been in development for a year before I took a break for a year cause super busy and it’s not even close to parity with the op2

To view this discussion on the web visit https://groups.google.com/d/msgid/pynastran-discuss/419504f7-cd69-487c-8110-745cf26836e8n%40googlegroups.com.

[Jacoues]

ok thank you.