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I have a TTree in ROOT with 1000 events and 15 variables associated to each of them. I would like to convert this in its entirety to an hdf5 dataset. How do I organise my data in HDF5 Groups such that I can access data both by event number and by variable (if I wanted all the data from the 'kinetic energy' variable, for example, all events)?

Note: I have already tried the root2hdf5 conversion tool but this does not work for branches with arrays/compound datatypes.

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You might want to give a try to DataHarvester.

This tool claims to support ROOT, HBOOK, HDF, XML, SQLITE and input/output between them.

See the following publication:

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