RE: [ROOT] help needed for a complicate question!

From: Philippe Canal (pcanal@fnal.gov)
Date: Fri Jun 29 2001 - 22:00:54 MEST 

Hi,

I am not sure if this is what you are looking for but you can do

ntupleVertexRaw->Draw("_1.z:_1.y:_1.x", "_1.z<60 && _1.y<20 && _1.x<10", "", 3292, 0);

Philippe.

-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Kai Yi
Sent: Friday, June 29, 2001 1:07 PM
To: roottalk@pcroot.cern.ch
Subject: [ROOT] help needed for a complicate question!


Hi, All Experts,
   Suppose I want to draw a cloud,or a density picture According to some
probability, I generated a lot of coordinates (x,y,z) which reflect the
density in 3D space. I then put x,y,z into a ntuple (tree). So my ntuple
is like:

                       myTree
                    |       |        |
                    x       y        z

Then I have the following operation:
      new TBrowser();
      From the browser, find the tree, clich right button on my mouse
and choose StartViewer, on this TreeViewer, I put _1.x into red X, _1.y
into red Y, _1.z into red Z. Then I press blue Draw, I get the cloud or
density  3D picture. I noticed that root automatically generate a command:
      ntupleVertexRaw->Draw("_1.z:_1.y:_1.x", "", "", 3292, 0);

My question is:
     How to set the range of x,y,z? right now I do not have control over
the range of x,y,z. Is it possible to set range somewhere, or there are
some other ways to do the same thing?

Thanks a lot!

Kai Yi

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