Re: hdf file attributes

[Stewart Dickson]

Hello, Dr. Thomas:

If you compare: http://octave.1599824.n4.nabble.com/read-data-subsets-from-HDF5-td2713674.html
Octave-General "read data subsets from HDF5" with the HDF Group's MATLAB examples, you will see two very different styles of accessing HDF data files.

MATLAB's HDF package contains the functions: H5F.open, H5D.open (file_id, DATAFIELD_NAME),
    H5D.get_space (data_id), H5D.read, H5S.close (data_space),
    H5A.open_name (data_id, ATTRIBUTE), H5A.read(attr_id), …
These allow you to parse named data fields and attributes from the HDF file before reading large amounts of data.

Octave's load -hdf5  function reads the entire file then requires the suer to parse the data fields from the structure
Octave creates in memory.

-Stewart Dickson, HDF Group

On:        May 27, 2010; 04:11pm
Brian Thomas-2 wrote:

I'm trying to use an HDF5 file in Octave 3.2.4.  I can read in the file using load('-hdf5',file), but I don't know how to access the file attributes.

I have a Matlab code that does it this way:

hdr=hdfinfo(filename);

file_attributes=hdr.Attributes;

Nmost_lat=file_attributes(39).Value;

I haven't been able to find equivalent commands in Octave.

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Dr. Brian Thomas

Assistant Professor of Physics and Astronomy, Washburn University

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