How to open two or more trees using ROOT::RDF::Experimental::FromSpec?

ROOT
9

Hi @kyoon,

thanks for your reply. In this case the situation will be a bit harder - yet not impossible, you can follow this other forum post for more details how to proceed with the TTreeIndex and creating a combined dataset: Modification of a RDataFrame with an extracted column - #3 by zazbone

Cheers,
Marta