Root to HDF5 Tree Converter

Run bin/ttree2hdf5 to convert your root tree to an HDF5 file.

Branches that contain basic types (one value per entry in the tree) are stored as a 1D array of compound data type. Branches that store vector<T> are stored in a 2D array, while branches of type vector<vector<T> > are stored in a 3D array. If you want more dimensions feel free to file an issue.

You can specify the maximum dimensions of the array with

ttree2hdf5 <root-file> -o <output-file> -l [dims..]

where the [dims..] argument can have up to two integers.

For more options check ttree2hdf5 -h.

Hacking This Code

I've tried to make this code as modular and straightforward as possible. Of course if anything is unclear you should file an issue.

The main algorithm ttree2hdf5 is a thin wrapper on copy_root_tree. Reading the code in src/copy_root_tree.cxx should be a decent introduction to the higher level classes you'll need to interact with.

As for compiling: anything in src/ which starts with ttree2hdf* will compile into an executable by default, whereas anything in src/ will compile and link to the executables by default.

To Do

Other things I might do sometime:

• Allow grouping of different branches into different output datasets
• Give the option to supply a TCut string to skim the ntuple
• Merge with the other root to hdf5 converter I made for histograms.

If you want these things, or anything else, file an issue.