[ROOT] variable length "arrays"

From: Stephen Adler (adler@bnl.gov)
Date: Sun Oct 29 2000 - 21:03:25 MET 

I'm trying to build a root tree with variable length arrays. In the
old days of paw/ntuples, using column wise ntuples, one was able to
define an array with a length as in

   alen[0:250],tracks[1:alen]

or something like that. I can't remember the paw/ntuple columb-wise
syntax becuase I haven't used it in years. In anycase, I want to do
the same with a root tree. Do I define a branch inside a branch or
something like that?

Cheers. Steve.

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