Question About root2array et al.

[Jacob Howard]

Hi Noel (or others),

Can you tell me if the include_weight/weight_name functionality of root2array works for multiple ROOT files?  E.g., if I have N ROOT files that I'm using root2array on, and I request that the tree weight be included as an array property, is the tree weight property for each event just taken from the tree in the first file, or is it taken from for the respective tree that each event is in?

I assume it is the latter (or my plots would look weird), but I just wanted to double check this at some point.  I'm not sure how the GetWeight() method of TChain works as you advance through entries, or exactly how root_numpy handles this.

Best,

Jacob

[Noel Dawe]

Hi Jacob,

Yes, it should always be the weight of the current tree. We have a unit test that checks this with two trees with different weights in a chain:

https://github.com/rootpy/root_numpy/blob/master/root_numpy/tests.py#L281

The current weight of the chain will be the weight of the current tree unless you use the "global" option in TChain's SetWeight method:

http://root.cern.ch/root/html/TChain.html#TChain:GetWeight

Noel

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[Jacob Howard]

Cool, thanks for the confirmation.

Best,
Jacob

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