How can I overwrite only one dataset without affecting other datasets in an HDF-file using HDF5WRITE in MATLAB 7.7 (R2008b)?

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MathWorks Support Team 2012-9-7

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I can read in one dataset from a file by specifying the dataset name in the HDF5READ command, but I am not able to overwrite just one of the datasets in the file using HDF5WRITE. The only options as I understand are:

1) Overwrite the whole file

2) append the dataset. But the condition here is that there shouldn't be an existing dataset with the same name.

I wanted to modify only one dataset in an existing HDF5 file without affecting the other datasets.

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Answer 1

MathWorks Support Team 2012-9-7

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As of MATLAB 7.13 (R2011a), HDF5WRITE has been deprecated by H5WRITE and H5CREATE.

The new syntax is,

% Create a dataset called "a" in the group "data" in the file "file.h5".
% Make that a one-dimensional dataset with one element
h5create('file.h5','/data/a',1)
% Write the value, 1000, to the dataset that was just created
h5write('file.h5','/data/a',1000);
% Overwrite the previous value
h5write('file.h5','/data/a',5000);