Issue loading structs saved by Octave

[precsim]

Saving a simple test struct created in Octave

a.b = 1;
save -v7 test.mat a

and loading with loadmat

loadmat('test.mat') 

returns the error

\temp\loadmat.py in read_struct_array(fd, endian, header)
    315     if field_name_length > 32:
    316         raise ParseError('Unexpected field name length: {}'.format(
--> 317                          field_name_length))
    318
    319     # read field names

ParseError: Unexpected field name length: 64

scalars work fine though, and importing structs from Matlab instead of Octave (as well as loading the test.mat file into Matlab).

[jcbsv]

Does it work with SciPy's loadmat?

from scipy.io import loadmat
loadmat('test.mat') 

[precsim]

Yes, that seems to work fine.

loadmat('test.mat')
{'__header__': b'MATLAB 5.0 MAT-file, written by Octave 6.2.0, 2021-03-12 10:01:17 UTC', '__version__': '1.0', '__globals__': [], 'a': array([[(array([[1.]]),)]], dtype=[('b', 'O')])}

It could be something with Matlab using the "small data element format" while I think Octave does not.

https://www.mathworks.com/help/pdf_doc/matlab/matfile_format.pdf (page 1-7)