How can I write a struct data into h5 file?

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

Answer 1

[Isaac Li]

I adapted the code from https://support.hdfgroup.org/HDF5/examples/api18-m.html and created a file exchange function struct2hdf5 for everyone to use: https://www.mathworks.com/matlabcentral/fileexchange/106470-struct2hdf5

Answer 2

[Sahithi Kanumarlapudi]

‘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

https://www.mathworks.com/help/matlab/ref/hdf5write.html

[per isakson]

Why recommend hdf5write rather than h5write ?

Answer 3

[per isakson]

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

Answer 4

[Xiao Jin]

I solved the problem. Thanks for you help!

[Richard Curry]

Could you tell us how you solved the problem pleasse? I'm having the same issue.