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How can I write a struct data into h5 file?

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Xiao Jin
Xiao Jin on 13 Dec 2019
Commented: Richard Curry on 6 Apr 2020
Hello everyone,
I have opened a .h5 file with MATLAB and want to change a dataset, which datatype ist H5T_COMPOUND (struct). I have written a new struct data (same struct, just one field's value changed), do you know how to write it into h5 file? Thank you!
Best Regards
Xiao

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Answers (3)

Sahithi Kanumarlapudi
Sahithi Kanumarlapudi on 16 Dec 2019
hdf5write' can be used to write data to a file in ‘.h5’ format.
For more information on how to use ‘hdf5write’ refer to the following link

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per isakson
per isakson on 20 Dec 2019
Why recommend hdf5write rather than h5write ?

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per isakson
per isakson on 20 Dec 2019
Edited: per isakson on 21 Dec 2019
If the Matlab support of HDF5 has not been updated in the most recent years there is no high level support for writing compound data to h5-files.
I found only this in the File Exchange Edit_struct_hdf5 by Renato Medeiros. It might be useful to you.
It can be done with the low level HFD5 functions, but I find it a bit tricky, YMMV. Did you study the low level Matlab samples at https://support.hdfgroup.org/HDF5/examples/api18-m.html, especially
  • Read / Write Compound Datatypes (Dataset) h5ex_t_cmpd.m and
  • Read / Write Compound Datatypes (Attribute) h5ex_t_cmpdatt.m

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Xiao Jin
Xiao Jin on 16 Jan 2020
I solved the problem. Thanks for you help!

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Richard Curry
Richard Curry on 6 Apr 2020
Could you tell us how you solved the problem pleasse? I'm having the same issue.

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