Re: copy selected entries of subset of chain

Hi Philippe

sorry, that was a typo in the e-mail, I have chain->SetBranchStatus("*", 1) in the code, as well as LoadEntry, GetEntry etc.

Margar

On Tue, Apr 12, 2011 at 2:58 PM, Philippe Canal <pcanal_at_fnal.gov> wrote:
> Hi Margar,
>
> (Besides the missing LoadEntry, GetEntry and SetBranchAddress which I assume
> are in the routines
> you did no show), it seems that the problem is the 2nd argument of the 2nd
> SetBranchStatus,
> I think it should read:
>
>   chain->SetBranchStatus("*", 1);
>
> Cheers,
> Philippe.
>
> On 4/12/11 2:43 AM, Margar Simonyan wrote:
>>
>> Hello ROOTTalk
>>
>> I would like to copy selected entries of some branches of TChain to
>> another tree. So far my attempt work for single tree but not for a
>> chain. Simplified logic looks like this:
>>
>> type var1;
>> TBranch * b1=0;
>> chain->SetBranchAddress("var1",&var1,&b)
>>
>> chain->SetBranchStatus("*", 0)
>> chain->SetBranchStatus("var1", 1);
>>
>> f = TFile::Open("file.root", "UPDATE");
>> newTree = chain->CloneTree(0);
>>
>> now have to enable all branches since they are needed for event selection
>> chain->SetBranchStatus("*", 0);
>> for(; ; )
>>  if(selection_function())
>>     newTree->Fill()
>>
>>
>> The trees are connected and when a new file is opened in chain things
>> go wrong. I tried reseting the branch addresses, but it didn't work.
>> Is there any way to get it working?
>>
>> Thanks,
>>       Margar
>> -------------------------------------------------------------------------
>>  Dr Margar Simonyan,  post-doctoral researcher
>>  Niels Bohr Institute, Copenhagen University
>> -------------------------------------------------------------------------
>>
>
Received on Tue Apr 12 2011 - 15:02:38 CEST