I refer to the discussion in post. I’m learning how to use RDataFrame and I would like to know, please, how to use the string expressions. For instance, in ROOT: tutorials/dataframe/df001_introduction.py File Reference, I don’t understand which is an
As I see, with
df.Define("b1", "(double) rdfentry_")\ .Define("b2", "(int) rdfentry_ * rdfentry_").Snapshot(treeName, fileName)
a .root file is created but I don’t figure out which entries are obtained.
Thanks in advance for your time.