Modify contents of HDF5 file but keep it readable by external programs

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Nike Dattani 2017-8-8

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https://ww2.mathworks.cn/matlabcentral/answers/351924-modify-contents-of-hdf5-file-but-keep-it-readable-by-external-programs

编辑： per isakson 2017-8-13

A FORTRAN/C++ program uses an input file with extension *.h5. I want to change the contents of one array in this h5 file to single precision and re-run the FORTRAN/C++ program. I've taken the following steps in MATLAB/Octave:

p=load('data.h5');
p.second.values=cast(p.second.values,'single');
save('data.h5','p');

The FORTRAN/C++ program crashes when looking for the data in the data.h5 produced by MATLAB in this way. I came to find that p=load('data.h5') does not store the data in p.second.values, but in p.p.second.values.

I just want the h5 file read by the FORTRAN/C++ program to be the exact same as before, except with second.values to be an array of single-precision numbers rather than double. Is there an easy way?

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Nike Dattani 2017-8-9

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I never thought I'd say it was easier to obtain a python solution, but here it is:

    import h5py
    import numpy as np
    FILENAME = 'data.h5'
    f = h5py.File(FILENAME, 'a')
    f['/second/values'][:] = f['/second/values'].value.astype(np.float32)