Questions about TTree::Draw()

From: Mark Boulay (mgb@owl.phy.queensu.ca)
Date: Mon Aug 10 1998 - 19:46:40 MEST


Dear root team,
	I have a couple of questions about using TTree:Draw().
First, I am wondering if it possible to produce a TTree containing
a TClonesArray branch, with some events having this array filled,
and others with an empty TClonesArray, and still use the TTree::Draw()
command for data contained in the TClonesArray.  I have a tree with these
characteristics, and can retrieve events with TTree::GetEvent(), but
using TTree::Draw() for data in the TClonesArray causes root to hang.
	The second (unrelated) question I have is about the autoscaling
of axies for TTree::Draw().  Is is possible to have the entire range 
of the data in the tree scanned before choosing the axis scaling?  It 
now seems that a small number of events are sampled to choose the scale.

Thanks in advance for your help,
Mark.


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=                                                               =
= Mark Boulay                                                   =
= Department of Physics   phone/voice mail: (613) 545-6861      =   
= Queen's University      fax: (613) 545-6813                   =
= Kingston, Ontario       email: mgb@sno.phy.queensu.ca         =             
= Canada, K7L 3N6                                               =
=                                                               =
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