Root_numpy/pandas preserves event order?

ROOT
1

Hi All,

Is the order of events persisted in a snippet like this:

    tree_root = file.Get('MyTree') 
    tree_numpy = root_numpy.tree2array(tree_root, branches=used_columns)
    tree_pandas = pandas.DataFrame(tree_numpy)

If I loop over these three objects, will the order of the values match in each case?

Thanks,
Kevin

2

My tests indicate that the order of the events is persisted. Maybe someone who knows more about root_numpy and pandas can confirm?

3

I would be astonished is the order of entries (rows) changes during the conversion of a ROOT TTree to a panda. The only mechanism I could imagine that the order may change is when you do the conversion in parallel, which is not the case right now.

4

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