RE: TClonesArray of Tracks with a TClonesArray of Hits as a data member

Hi Vincent,

The ability to drill through un-split object in the TBrowser is new and *as you noticed) not complete yet.
We will check into this case.  

In the meantime, you can still access your data simply by typing the corresponding draw command:  

   mytree->Draw("theTracks.Hits.r");

Note that the @size (when it works :) ) is used to draw an histogram of the number of elements in the collection.

Cheers,
Philippe

From: Vincent Roberfroid [mailto:roberfroid_at_fynu.ucl.ac.be] Sent: Wednesday, May 18, 2005 8:19 AM
To: Philippe Canal
Cc: roottalk_at_pcroot.cern.ch
Subject: Re: [ROOT] TClonesArray of Tracks with a TClonesArray of Hits as a data member

Hi Philippe,

Thank you for your answer.
I used root 4.02/00.
But it does not work with root 4.04/02.
When I click on "theTracks.Hits" I get also the same message : Warning in <TSelectorDraw::ProcessFillObject>: Not implemented for TClonesArray

I have also an new variable in the Track branch : "@size". But when I click on it I get the following message : Error in <TTreeFormula::DefinedVariable>: Unknown method:GetEntries() in Track

*ERROR 30 :
 Bad numerical expression : "Track.GetEntries()"

It is maybe related ?

Vincent

Philippe Canal wrote:

                So, how can I do to see the variables r, phi and z of a hit belonging to

                a Track ? The split level is good ? Is it possible to have a TClonesArray                     

        in a           

                TClonesArray include in a TTree ?                              

        It is possible to have a TClonesArray within a TClonesArray. However they

        can not be split. To see the data member in the Browser you should use

        ROOT 4.04/02 (note that you forgot to mention which version of ROOT you

        were using).         

	Cheers,
	Philippe.
	
	-----Original Message-----
	From: owner-roottalk_at_pcroot.cern.ch
[mailto:owner-roottalk_at_pcroot.cern.ch]
	On Behalf Of Vincent Roberfroid
	Sent: Wednesday, May 18, 2005 4:10 AM
	To: roottalk_at_pcroot.cern.ch
	Subject: [ROOT] TClonesArray of Tracks with a TClonesArray of Hits
as a data
	member
	
	Dear root users,
	
	I have a TTree containg a TClonesArray of Tracks (a class derivating

	from TObject).
	And a data member of Track is also a TClonesArray containing Hits
(an 
	other class derivating from TObject).
	So here is the structure :
	
	class Track : public TObject


	{

	  public :
	
	  double      R;         /** track parameters **/
	  double      phi0;
	  int             Nhits; 
	  ...
	  TClonesArray   *Hits;   /* all the hits in a TClonesArray */
	}
	Track::Track(axial_track *atrack)  /* the constructor - axial_track
is 
	just a struct*/


	{

	  R=atrack->R;
	  phi0=atrack->phi0;
	  for(int i=0; i<Nhits;i++)
	      new(Hits->operator[](i)) Hit(atrack->mvdhit[i]);  /* Fill the 
	TClonesArray */
	}
	//-----------------------------------
	class Hit : public TObject


	{

	  public :
	
	    float r;          /**  r-phi cluster position  **/
	    float phi;
	    float z;
	    ...
	}
	
	And in the main :
	TTree *outTTree = new TTree("outTTree","Output TTree");
	TCLonesArray *theTracks = new TClonesArray("Track",100);
	outTTree->Branch("theTracks",&theTracks,4000,2);
	
	The code runs well, the variables R, phi0 and Hits are visible in
the 
	Track branch, but when I click on Hits I get the following message :
	Warning in <TSelectorDraw::ProcessFillObject>: Not implemented for 
	TClonesArray
	
	So, how can I do to see the variables r, phi and z of a hit
belonging to 
	a Track ?
	The split level is good ? Is it possible to have a TClonesArray in a

	TClonesArray include in a TTree ?
	And is it possible to use the TreeViewer with it ?
	
	Thanks a lot.
	Vincent