Hi! I have a TTree of tracks which have an collision/event identifier. (in principle there is a guarantee that they are consecutive entries)
Is there a (rdf) way to transform such a tree to a tree/collection of objects that are grouping those tracks in events?
Thank you!
Hi,
if you want to read the data into memory in the new form, you can do it by writing appropriate code in a Foreach or in a custom action helper that you pass to Book.
I can’t think of a simple way to stream the data in RDF, transform it like that and then Snapshot it in a new output TTree all in one go, without buffering everything in RAM fist, because the output TTree would have a “too different” number of entries w.r.t. the input tree (i.e. not just less entries because of selections).
I hope this helps!
Enrico
well, the chain can be many GiB in size… and now i realize that my problem have also a component of “look-ahead” which is against the idea of parallel parsing of the tree…
I could parse twice the tree/chain, first to establish the mappings collisionId <-> entries (entry list)
and then just pick the entries for each collisionId…
This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.