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Description
Feature description
It seems possible to create on the fly a TH1/2/3 and THn histograms from an existing RDataFrame instance.
However, it seems not to be possible to fill directly a THnSparse object from the data frame.
It would be great to be able to invoke RDataFrame::HistoNSparseD or similar to get this kind of object in a similar way as we can retrieve it using RDataFrame::HistoND.
See further discussions at the following root-forum post:
https://root-forum.cern.ch/t/creating-a-thnsparse-using-rdataframe/55965/5
Alternatives considered
No response
Additional context
No response