Hi all, I'm trying to build a data structure in a ROOT file which contains several levels of data. i.e. header events -> calibration tracks -> track parameters -> hits -> position amplitude etc i.e. Within each "event" there will be many "calibration" events and many "tracks" each of which contain many "hits". Essentially, it is like the example in the distribution ( class Event and Track ) but with another layer ( in that context, "Track" contains a number of "Hits" ). As documented in the example "How to Create and Fill a tree", TClonesArrays cannot be used except for the last level of data with automatic splitting ( i.e. As I understand it, "tracks" will contain a TClonesArray of "hits" ). The question is, what is the best structure to use for the levels above and how are they implemented? Thanks in advance, Dave Bailey /------------------------------------------/ David Bailey : Antares post-Graduate / Nuclear and Astrophysics Laboratory / Keble Road, Oxford OX1 3RH /-------/ (01865) 273395 /------------/ -----------------/ d.bailey2@physics.ox.ac.uk
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