HDF5 export

[higgx2]

Hello,

I'm trying to export some MF4 File to HDF5 Format, but I am not able to find the group specific timestamps channel.
Can anybody explain, which part I am missing to set it up correctly?

Thx

[danielhrisca]

What arguments do you use when you call export?

[higgx2]

Hi Daniel (@danielhrisca),

I would like to propose to insert something like this (starting in line 1425 mdf.py):

asammdf/asammdf/mdf.py

Line 1425 in 1507f10

                    master = self.get(group.attrs["master"], group_index)
                    if reduce_memory_usage:
                        master.timestamps = downcast(master.timestamps)
                    if compression:
                        dataset = group.create_dataset(
                            group.attrs["master"], data=master.timestamps, compression=compression
                        )
                    else:
                        dataset = group.create_dataset(
                            group.attrs["master"], data=master.timestamps, dtype=master.timestamps.dtype
                        )
                    unit = master.unit.replace("\0", "")
                    if unit:
                        dataset.attrs["unit"] = unit
                    comment = master.comment.replace("\0", "")
                    if comment:
                        dataset.attrs["comment"] = comment

[danielhrisca]

@higgx2 can you send a PR?

[higgx2]

sorry but I am failing to send a PR. I have to clone the development branch right? And then I introduce my changes commit and push, right? After that I could do a PR chosing to request a merge from dev to master? Unfortunately I am obviously not granted to send the push command...

[higgx2]

@danielhrisca: Ok, I forked the project, insert the changes and after commiting I created a pull request from my fork (master) to the main project (master). Hopefully, I did it the right way.

[airotz]

Hi Daniel,

The export to hdf5 does not work in my case... here the traceback:

mdf.export(fmt="hdf5",filename="export.hdf")
Traceback (most recent call last):
File "", line 1, in
File "xxx/.local/lib/python3.8/site-packages/asammdf/mdf.py", line 1463, in export
master = self.get(group.attrs["master"], group_index)
File "/xxx/.local/lib/python3.8/site-packages/asammdf/blocks/mdf_v4.py", line 6594, in get
vals, timestamps, invalidation_bits, encoding = self._get_scalar(
File "/xxx/.local/lib/python3.8/site-packages/asammdf/blocks/mdf_v4.py", line 7282, in _get_scalar
timestamps = concatenate(timestamps, out=out)
File "<array_function internals>", line 180, in concatenate
ValueError: Output array is the wrong shape

It seems like it is having some trouble with the master... Could you please confirm?

Thank you very much in advance for your answer.

Best regards,
Igor