How can I separate out the event ID's in a TChain that have the same value

Newbie
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4

Hello,

there are a few options:

  • Are you using RDataFrame or a plain TChain to analyse the files? In RDataFrame, you can ask for file name and entry number. This is called DefinePerSample.
  • In a TChain, you can list the files first, get them in a stable order, and create the chain. Now, by just counting every event before the cuts, you should get a “stable” global event number.
  • If you don’t have a stable order, you can ask a TChain for the current file, see e.g. in this post. This can be used to derive a unique ID from the filename and entry number.

There might be more ways, but let’s see if one of the above can work for you.