Re: using class methods in treeViewer/Draw()

Hi,

yes that works with the fH member of Event. But in the fTracks TClonesArray it doesnt work. There I cant plot e.g. Track::GetPt() which calculates a return value out of member variables. This is exactly what I want though. Is this possible?
Or to ask in another way, why does it work with a TH1D and not with a TObject derived Track class?

Cheers, Christian

On Tue, 2007-08-21 at 10:13 +0200, Rene Brun wrote:
> Hi Christian,
>
> As an example run $ROOTSYS/test/Event with
> Event 500 1 99 1
> then run the following session
> root [0] TFile f("Event.root")
> root [1] T.Draw("fH.GetMean():fH.GetRMS()")
> You can also call a member function from TBrowser
> -click on "ROOT Files" ->Event.root -> T -> event -> fH
>
> Rene Brun
>
> hoeppner_at_e18.physik.tu-muenchen.de wrote:
> > Sorry that Ididnt completely get it, but in Rene's answer, what exactly is
> > "obj" supposed to be. I tries the Branch name, the Class name, ...
> >
> > Cheers, Christian
> >
> >
> >
> >> With TTree::Draw you can do
> >> T.Draw("obj.Function(params,..)" (see doc)
> >>
> >> same with TBrowser.
> >> A future version of TTreeViewer will also provide this functionality.
> >>
> >> Rene Brun
> >>
> >> Christian Hoeppner wrote:
> >>
> >>> Hi everybody,
> >>>
> >>> I have a question: Is it possible to directly plot or cut on a return
> >>> value of a method instead of a member variable. E.g.: I have a class
> >>> event : public TObject, that I write to my tree, that has a method with
> >>> the prototype
> >>>
> >>> double getMinResid();
> >>>
> >>> I want to plot some histogram out of the tree viewer or with Draw() and
> >>> want to cut on this for example. Is this possible and if yes how. Of
> >>> course if it is not possible I could just save the output of the method
> >>> in the event as well.
> >>>
> >>> Thanks a bunch, Christian
> >>>
> >>>
> >>
> >
> >
>
Received on Tue Aug 21 2007 - 13:23:20 CEST