JSROOT: Some RNTuples are not fully displayed

thea · December 6, 2025, 9:55am

Hi,

While playing with RDataFrames and RNtuples, I noticed that JSROOT sometimes fails to show the content of RNTuples in the viewer. This is not the case with all RNtuples. I was able to explore and plot the content of a different RNtuple, so the issue seems to be related to RNtuple (or TFile??) content?

In case it’s useful, an example of both cases is available here:

I used the latest ROOT pip wheel for producing the RNuples.
For completeness, the same issue is not present if the same data is saved as TTrees.

Cheers,
Alessandro

ROOT Version: 0.1a9/6.38, JSROOT 7.10
Platform: Linux
Compiler: Not Provided

dastudillo · December 7, 2025, 4:33am

If I open the files online ( Read a ROOT file ) I don’t seem to see that problem, see below; what is different for you? One thing is that in f_tuple.root the tree called tuple is directly on the first level directory inside the file, and in f_tuple_not_shown.root the (same?) tree has a different name (tpmaker…) and is inside a couple levels (triggerAna/TriggerPrimitives), but I can draw the variables by clicking on them.