[ROOT] multiple branches with different lengths (a FAQ?)

From: Piotr Zolnierczuk (zolnie@iucf.indiana.edu)
Date: Tue Nov 26 2002 - 20:00:09 MET 

Hi,
	it is probably a FAQ but I could not find any answer by browsing
HOWTO's nor roottalk digest.

Here is my problem:
I want to create a tree with two branches:
1) a "regular" branch with my data (a class)

2) a single entry branch that would describe configuration say 
date/time/comment


my (meta) code looks as follows

{
   file  = new TFile("mini.root","RECREATE");
   tree  = new TTree("myEvents","A tree with vents");
   eve   = new RawEvent();
   des   = new RunDescr();

   eveBr = tree->Branch("RawData"       ,"RawEvent",&eve,100,99);
   desBr = tree->Branch("RunDescription","RunDescr",&des,100,99); // not 
sure about split param


   des->clear();
   des->setTime(time(0));
   des->setComment("comment");

   tree->Fill();

   for(int i=0; i<MAX_DATA; i++) {
     eve->clear();
     eve->setData(data);
     tree->Fill();
   }

   file->Write();
   delete file;
   return;
}



The question is how to avoid multiple filling of the desBr branch
cause it the mini.root file seems to have MAX_DATA entries in desBr

Piotr



-- 
  ________________________________________________________________
  Piotr Adam Zolnierczuk                                          	
  Indiana University                        phone:  (812) 855-3613	
  Cyclotron Facility                        fax:    (812) 855-6645	
  2401 Milo B Sampson Ln       e-mail:     zolnie@iucf.indiana.edu	
  Bloomington,IN 47408, USA    http://www.iucf.indiana.edu/~zolnie	
  ________________________________________________________________	
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