What is the recommended way to retrieve the weighted number of entries in a
I could, for example, do
nEntEffective = sum(ent.SomeWeight for ent in t if ent.SomeBranch > SomeCutValue)
but I wondered if I had overlooked some utility function a la
t.GetEntries('SomeBranch > SomeCutValue') that would take weights into account.
ROOT Version: 6.19/01
Compiler: Not Provided
df.Filter("x > y").Sum("weight")
Thank you. From my cursory study, these methods appear comparably fast if one has to make the data frame (i.e.,
RDataFrame(t).Filter('SomeBranch > SomeCutValue').Sum('SomeWeight')), while the data frame method appears much faster if one has already created the filtered data frame (
See this thread, the event loop is much faster with RDF, but for small datasets you’ll spend most of the time setting up RDF.
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