Re: TTree sub-branches

Hi Jochen,

If you want to group index and ar in the same branch you must go via your testClass.
But why do you want to group, this makes everything slower and less efficient.

Rene

Jochen Klein wrote:
> Hi Rene,
>
> thanks for the quick answer. However, what I was after is to have the
> branches index1, ar1 grouped together in one branch, e.g. b1, and
> index2, ar2 in another one, e.g. b2. So the grouping as in the first case
> but without the implementation of testClass, e.g. by branching a TBranch
> as it is done during the automatic splitting procedure. However, I did
> not find such a feature.
>
> Cheers,
> Jochen
>
> On 05.03.2010, at 10:54, Rene Brun wrote:
>
>> Hi Jochen,
>>
>> If you have your class testClass, you should do:
>> tree->Branch("b1.", &testClass1)
>> tree->Branch("b2.", &testClass2)
>> Note the "." at the end of the branch names (see doc of TTree::Branch
>> for explanation).
>>
>> If you do not want the class testClass and assuming :
>> Int_t index1, index2;
>> TClonesArray ar1, ar2, you can do directly
>>
>> tree->Branch("index1",&index1,..)
>> tree->Branch("index2",&index2,..)
>> tree->Branch("ar1",&ar1,..)
>> tree->Branch("ar2",&ar2,..)
>> Rene Brun
>>
>> Jochen Klein wrote:
>>> Dear all,
>>>
>>> I am wondering whether it is possible to create sub-branches for a
>>> TTree,
>>> i.e. I would like to create e.g. two branches as they would be
>>> created by
>>>
>>> class testClass {
>>> Int_t index;
>>> TClonesArray ar("someClass");
>>> }
>>>
>>> testClass testClass1;
>>> testClass testClass2;
>>>
>>> tree->Branch("b1", &testClass1)
>>> tree->Branch("b2", &testClass2)
>>>
>>> without implementing testClass (which has no functionality in my
>>> case). So
>>> can I create the branches b1/b2 and then add the branches for index
>>> and ar
>>> to each of them?
>>>
>>> The wanted behaviour could probably also be achieved by first
>>> creating folders
>>> but I am looking for a direct way of creating the tree structure.
>>>
>>> Thanks for your help,
>>> Jochen
>>>
>>
>
Received on Fri Mar 05 2010 - 15:18:44 CET