Nested data structures using TClonesArrays

From: David Bailey (Antares Post Graduate) (d.bailey2@physics.ox.ac.uk)
Date: Thu Dec 02 1999 - 18:37:43 MET 

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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