[ROOT] variable length branches in TTree's

From: Peter Steinberg (steinber@rcf.rhic.bnl.gov)
Date: Thu Jun 15 2000 - 18:43:27 MEST 

Hi -

Is it straightforward to have variable-length branches
in a TTree?  I would like to have functionality a la HBOOK
CWN's, i.e. a branch which has a leaflist like:

"N:x[N]/F:y[N]/F:z[N]/F" etc.

where i point the branch to a structure defined somewhere:

{
  Int_t N;
  Float_t x[32];
  Float_t y[32];  
  Float_t z[32];
}

The point is that when I set N to 10, then only 10 x,y,z's will be
filled in.

I am somewhat of a novice with trees, so this may be simple, but
i have been unable to make anything work.

Regards,
Peter

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Dr. Peter A. Steinberg			      Brookhaven National Laboratory
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Office: 631-344-4390			      mailto:Peter.Steinberg@bnl.gov
Mobile: 917-549-3094                       http://www.rhic.bnl.gov/~steinber
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