How can I write and read logical data types to my HDF5 data file in MATLAB 7.8 (R2009a)?

I am using HDF5 low-level functions to write data to an HDF5 file. I would like to save my MATLAB LOGICAL array to HDF5. I have tried using the following code:

fid = H5F.create('myhdf5.h5','H5F_ACC_TRUNC','H5P_DEFAULT','H5P_DEFAULT');

dspace = H5S.create_simple(1,10,10);

dset = H5D.create(fid,'BoolTest','H5T_NATIVE_HBOOL',dspace,'H5P_DEFAULT');

H5D.write(dset,'H5T_NATIVE_HBOOL','H5S_ALL','H5S_ALL','H5P_DEFAULT',rand(10,1));

H5D.close(dset);

H5S.close(dspace);

H5F.close(fid)

However this fails with the error:

 ??? Error using ==> hdf5lib2

 Incorrect type of array passed

 to H5D.write in conjunction with

 the specified memory datatype.

 Error in ==> H5D.write at 37

 H5ML.hdf5lib2('H5Dwrite',

 varargin{:});

Answer 1

[MathWorks Support Team]

HDF5 1.8.x does not support a boolean datatype. To work around this, use an integer type and interpret your data according to your rules.

For more information see the HDF5 FAQ by doing an internet search for: "HDF5 faq boolean".