Re: Duplicated tree

Hi Rene,

OK, so this is what's going on. I use these in a chain (I have O(100) such output files for each dataset). How can I read these back transparently?

Best regards,
James.

On 22 Apr 2009, at 15:52, Rene Brun wrote:

> see http://root.cern.ch/root/html/TTree.html#TTree:AutoSave
>
> Rene Brun
>
>
> James Jackson wrote:
>> Hi,
>>
>> I'm trying to track down a strange problem... I have some common
>> code, which I run over many datasets, to create and fill some
>> trees. Each tree is created once, and only once.
>>
>> In some instances, the resulting ROOT file has duplicates. The
>> output should look like this:
>>
>> Unknown-00-17-f2-51-00-e3:PhotonJetPt15 jamesjackson$ root -l
>> output_15.root
>> root [0]
>> Attaching file output_15.root as _file0...
>> root [1] TDirectory *d = _file0.Get("tupiliser")
>> root [2] d->ls()
>> TDirectoryFile* tupiliser tupiliser (Tupiliser) folder
>> KEY: TTree EventData;1 Per event object information
>> KEY: TTree McElectrons;1 MC Electrons
>> KEY: TTree HeepElectrons;1 HEEP Electrons
>> KEY: TTree Tracks;1 Tracks
>> KEY: TTree SuperClusters;1 SuperClusters
>> KEY: TTree GenData;1 GenData
>>
>> However, sometimes, I get the following:
>>
>> Unknown-00-17-f2-51-00-e3:QCDpt30 jamesjackson$ root -l output_1.root
>> root [0]
>> Attaching file output_1.root as _file0...
>> root [1] TDirectory *d = _file0.Get("tupiliser")
>> root [2] d->ls()
>> TDirectoryFile* tupiliser tupiliser (Tupiliser) folder
>> KEY: TTree Tracks;3 Tracks
>> KEY: TTree Tracks;2 Tracks
>> KEY: TTree EventData;1 Per event object information
>> KEY: TTree McElectrons;1 MC Electrons
>> KEY: TTree HeepElectrons;1 HEEP Electrons
>> KEY: TTree SuperClusters;1 SuperClusters
>> KEY: TTree GenData;1 GenData
>>
>> Note "Tracks" is duplicated.
>>
>> Does this look like anything anyone's seen before? Can anything
>> trigger a re-creation of a tree during filling?
>>
>> Any hints welcome - I can see nothing in my code that would re-
>> create the tree.
>>
>> Regards,
>> James.
>>
>
Received on Wed Apr 22 2009 - 16:55:30 CEST