Re: using class methods in treeViewer/Draw()

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 - 10:13:54 CEST