[ROOT] adding arrays to trees

From: Jodi I Lamoureux (JILamoureux@lbl.gov)
Date: Thu Sep 26 2002 - 02:17:18 MEST 

Hi Rene,

     I need to make some branches that look a little like a
column-wise ntuple.  As a simple test, I added two arrays to a
tree... see the example below.  When I brows the leafs in root,
they are identical.  Both "epoch" and "mag" have identical
values even though buff is 2*eps long and contains the epoch
array followed by the mag array.

  // variable-length arrays:
  event->Branch("eps",&eps,"eps/I");
  event->Branch("lightCurve",buff,"epoch[eps]/D:mag[eps]/D");

    Can you send me an example of something like this that works?
I would for example like to see  the 2nd example in the user manual,
"A Tree with a C Structure" that records all the structure elements
in one branch.

           Thanks,

              Jodi Lamoureux

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