> How can I make it so that BestTrack to have two sub-branches;
> TPC1Segment and TPC2Segment.
Beside an artefact of the way the information is stored and the simple way the TTreeViewer is displaying the information, this is already essentially what you have.
There is much you can do to make the display more like what you want. (The closest you could get would be to prevent the splitting of the TPC1Segment and TPC2Segment datamember (by adding the comment //|| just after their declaration) but then the TTreeViewer will not longer be able (for now) to expand those variable (However the TBrowser would be able to do it).
> Is my only solution now to use the approach with
> TVirtualCollectionProxy that you mentioned
This is __not__ a solution is this case. It would not give any visual improvement over what you could get with a std::vector.
Cheers,
Philippe.
-----Original Message-----
From: Christian Hansen [mailto:hansen_at_uvic.ca]
Sent: Monday, February 19, 2007 5:09 PM
To: Philippe Canal
Cc: 'roottalk'; roottalk_at_pcroot.cern.ch
Subject: RE: [ROOTDEV] subbranches?
Hi Philippe,
thanks alot for the vector-approach suggestion.
If you use TTreeViewer to look at the tree inside
testTree.root (see attached trackTest.tgz) you see
that it worked for "TPCTracks" that now is a vector
of TTestTracks.
But what if I want, as an example, "track segments"
of the tracks to expand as sub-branches.
In that case I cannot use a vector since I do not
want the variables of different segments to be
histogramed together.
To explain easier I added a "BestTrack" to the testBranch.
If you expand the BestTrack with the TTreeViewer
it looks like BestTrack has one variable called
BestTrack.TPC1Segment.Momentum
and another variable called
BestTrack.TPC2Segment.Momentum.
How can I make it so that BestTrack to have two sub-branches;
TPC1Segment and TPC2Segment.
If these two sub-branches are expandable with the
TTreeViewer one then could get the "Momentum" of
each of these segments by expanding them.
Is my only solution now to use the approach with TVirtualCollectionProxy that you mentioned? If so, where could I find an example where this has been done before?
Cheers
/Chris
> Hi Christian,
>
> Your class TTrackCollection is not known to ROOT as
> a 'collection' but just as a series of unrelated data
> member and thus it has no way to collate them the way
> you want. You __could__ advertize your class as a
> collection (via a hand code TVirtualCollectionProxy)
> but this is certainly much more work than the easy
> alternative.
>
> I simply recomment that you replace the 3 data member
> of TTrackCollection by:
> std::vector<TTestTrack> Track;
> (or even maybe replace TTrackCollection entirely by
> std::vector<TTestTrack>). You could also used any
> of the other existing/supported collection (all
> STL collections or TClonesArray).
>
> You should then get from TTreeViewer the behavior you
> want.
>
> Cheers,
> Philippe.
>
> -----Original Message-----
> From: owner-rootdev_at_pcroot.cern.ch [mailto:owner-rootdev_at_pcroot.cern.ch]
On
> Behalf Of Christian Hansen
> Sent: Saturday, February 17, 2007 7:40 PM
> To: Philippe Canal
> Cc: 'roottalk'; roottalk_at_pcroot.cern.ch
> Subject: RE: [ROOTDEV] subbranches?
>
>
> Hi Philippe,
>
> thanks a lot for your respond!
>
> So if I understood you right the only way to make
> for example a "collection of tracks" to expand in
> the TTreeViewer is to make the collection to be a
> branch. I did a small test program that I attached
> to this email (see trackCollectionTest.tgz).
> After compiling and running it produces "testTree.root".
> When I use the TTreeViewer to look at the tree in
> testTree.root the collections of tracks (TPCTracks
> and FGDTracks) expand but in each of these
> collections I have three TTestTracks that I hoped
> they would also expand in the TTreeViewer in the same
> way as the TTrackCollections. But instead the variables
> of the tracks are seen as leafs of the collections and
> not as leafs of the tracks. Does this happen also for
> you when you look at the testTree.root with the
> TTreeViewer? If then, why is that so?
>
> Is this is the only way to have a collection of tracks
> to expand in the TTreeViewer or is there some other
> recommended way?
>
> Thanks alot!
> /Christian
>
>
>
>
> > Hi Christian,
> >
> > A priori, all real sub-branches are shown in the TTreeViewer.
> >
> > In the case of test/Event, fLastTrack is a TRef and hence has
> > __no__ real sub-branches. In addition the TTreeViewer still
> > needs to be renovated :) to handle some of the newer case
> > (like the ability to automatic follow the references).
> >
> > You may find that the TBrowser is able to better unwind
> > branches since it is also able to drill though non split
> > branches (aka unwind objects).
> >
> > Cheers,
> > Philippe
> >
> > -----Original Message-----
> > From: owner-rootdev_at_pcroot.cern.ch [mailto:owner-rootdev_at_pcroot.cern.ch]
> On
> > Behalf Of Christian Hansen
> > Sent: Saturday, February 17, 2007 7:07 AM
> > To: roottalk; roottalk_at_pcroot.cern.ch
> > Subject: [ROOTDEV] subbranches?
> >
> >
> > Dear Rooters,
> >
> > I'm having problems expanding sub-branches in the
> > TreeViewer. Since my program looks very much like
> > the MainEvent.cxx example provided in the "test"
> > folder, I can base my question on this example:
> >
> > In the "test" folder in root version 5.04/00
> > I compiled and ran ./Event
> > Then I used the TreeViewer to look at the TTree
> > in the Event.root file.
> > Why does all variables of "event" looks like leafs
> > in the viewer?
> > Is it possible to make for example fLastTrack an
> > expandable sub-branch so that one could reach e.g.
> > the last tracks fPx, fPy and fPz with the TreeViewer?
> >
> > I get some warnings when I open the TreeViewer:
> > Warning in <TClass::TClass>: no dictionary for class Event is available
> > I tried to produce dictionaries with cint, but without
> > any luck.
> >
> > Is there any way I can make the sub-branches expandable
> > in the TreeViewer?
> >
> > With best regards
> > / Christian Hansen
> >
> > PS. I have no problems in reading in a complex TTree,
> > this is just about using the TreeViewer.
> >
> >
> >
> >
> >
> >
> > ================================================
> > Dep. of Phys. Office: +1 250 721 7710
> > Univ of Victoria Mobile: +1 250 588 0860
> > PO Box 3055
> > V8W 3P6 Victoria BC
> > Canada
> > ------------------------------------------------
> > Home Page : http://particle.phys.uvic.ca/~hansen
> > http://cern.ch/christian.hansen
> >
> >
> >
>
> / Christian Hansen
>
> ================================================
> Dep. of Phys. Office: +1 250 721 7710
> Univ of Victoria Mobile: +1 250 588 0860
> PO Box 3055
> V8W 3P6 Victoria BC
> Canada
> ------------------------------------------------
> Home Page : http://particle.phys.uvic.ca/~hansen
> http://cern.ch/christian.hansen
>
>
/ Christian Hansen
Dep. of Phys. Office: +1 250 721 7710 Univ of Victoria Mobile: +1 250 588 0860PO Box 3055
http://cern.ch/christian.hansen Received on Tue Feb 20 2007 - 16:56:43 CET
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