Error writing array of class double to a HDF5 file

Hi

I am having trouble with the following code:

data = zeros(100);
for i = 1:100
    for j = 1:100
        data(i, j) = rand(1,1) + 1i*rand(1,1);
    end
end
h5create("test.h5", "/test", size(data));
h5write("test.h5", "/test", data);

I am trying to write data of class double to a hdf5 file which I create but I recieve the following error

Warning: Conversion from double to datatype H5T_NATIVE_DOUBLE may clamp some values.

> In H5D.write (line 100)

In h5write (line 138)

Error using hdf5lib2

The class of input data must be double instead of double when the HDF5 class is H5T_IEEE_F64LE.

Error in H5D.write (line 100)

H5ML.hdf5lib2('H5Dwrite', varargin{:});

Error in h5write (line 138)

H5D.write(dataset_id,'H5ML_DEFAULT',memspace_id,filespace_id,dxpl,Data);

I have tried specifying the datatype when I create the hdf5 file but I recieve the same error message

h5create("test.h5", "/test", size(data), 'Datatype','double');
h5write("test.h5", "/test", data);

Thanks in advance

Answer 1

[Shivam Sardana]

Problem with your code is variable data is of complex double type. The error indicates there is a mismatch. To resolve this convert data from complex double type to double type.

data = zeros(100); 
for i = 1:100 
    for j = 1:100
        data(i, j) = rand(1,1) + 1i*rand(1,1);
    end
end 
data = real(data); 
h5create("test.h5", "/test", size(data), 'Datatype','double'); 
h5write("test.h5", "/test", data);