Draw a brunch while applying cut from another TTree

ROOT
1

I have a root file with the following structure

[ul]
[li]Tree 1
[list]
[]Brunch 11
[/li][li]Brunch 12
[/li][/ul][/:m]
[li]Tree 2
[ul]
[]Brunch 21
[/li][li]Brunch 22
[/li][/ul][/:m][/list:u]

I know that I can do

Is there a way to do

2

TTree::AddFriend

3

I guess the best is to make the two trees “friends”. See the example here:
root.cern.ch/root/html/tutorials … end.C.html

In particular in the method DrawFriend() notice:

   T->Draw("x:TF.x");
4

Ooops, Wile and I replied at the same time … good we said the same thing :slight_smile:
Olivier

5

The problem is that the brunch names in both trees are the same. So actually it’s like

[ul]
[li]Tree 1
[list]
[]BrunchA
[/li][li]BrunchB
[/li][/ul][/:m]
[li]Tree 2
[ul]
[]BrunchA
[/li][li]BrunchB
[/li][/ul][/:m][/list:u]

So I can do

but then how am I going to draw BrunchA for Tree1 when BrunchA or BrunchB for Tree2 have to meet a condition?

6

A general form to uniquely identify a “” from a “” from a “”, when using the “Draw” method, is: ..