[Halld-offline] root tree issue

[David Lawrence]

This sounds like the problem Thomas and Brad recently were seeing when a branch had
not entries. You might compare details with them.




> On Apr 17, 2017, at 2:44 PM, Beni Zihlmann <zihlmann at jlab.org> wrote:
> 
> Hi Mike,
> the tree is small:
> 
>   TreePi0->Branch("EventNUM",&EventNUM,"EventNUM/l"); // lower case l for ULong64_t
>   TreePi0->Branch("RFT", &RFT, "RFT/F");
>   TreePi0->Branch("Nbeam", &Nbeam, "Nbeam/I");
>   TreePi0->Branch("BeamE",BeamE,"BeamE[Nbeam]/F");
>   TreePi0->Branch("BeamT",BeamT,"BeamT[Nbeam]/F");
>   TreePi0->Branch("Nneut", &Nneut, "Nneut/I");
>   TreePi0->Branch("NeutralX", NeutralX, "NeutralX[Nneut]/F");
>   TreePi0->Branch("NeutralY", NeutralY, "NeutralY[Nneut]/F");
>   TreePi0->Branch("NeutralZ", NeutralZ, "NeutralZ[Nneut]/F");
>   TreePi0->Branch("NeutralT", NeutralT, "NeutralT[Nneut]/F");
>   TreePi0->Branch("NeutralE", NeutralE, "NeutralE[Nneut]/F");
>   TreePi0->Branch("DetSys", DetSys, "DetSys[Nneut]/I");
>   TreePi0->Branch("Nstart", &Nstart, "Nstart/I");
>   TreePi0->Branch("SC_E", SC_E, "SC_E[Nstart]/F");
>   TreePi0->Branch("SC_T", SC_T, "SC_T[Nstart]/F");
>   TreePi0->Branch("SC_S", SC_S, "SC_S[Nstart]/I");
> 
> filling the tree is done between locks
>   japp->RootFillLock(this);
>     ..........
>   japp->RootFillUnLock(this);
> 
> the integer numbers are ok.
> it looks like I overwrite some array however I make sure that that does not happen.
> at least thats what I thought I did ;-)
> 
> 
> 
> 
> 
> On 04/17/2017 01:57 PM, Michael Staib wrote:
>> Hi Beni,
>> 
>> How big is the tree? Maybe the negative number of bytes is some kind of overflow in a uint->int cast. Does it happen for all of the files or just a few?
>> 
>> -Mike
>> 
>> --
>> Michael Staib
>> Graduate Student, Dept. of Physics
>> Carnegie Mellon University
>> mstaib at cmu.edu <mailto:mstaib at cmu.edu>
>> phone: 412-268-2983
>> 
>> 
>> 
>>> On Apr 17, 2017, at 11:59 AM, Beni Zihlmann <zihlmann at jlab.org <mailto:zihlmann at jlab.org>> wrote:
>>> 
>>> Does anyone have an idea what I am doing wrong in my Tree?
>>> Creating and writing a tree does not snow any error. However when opening the file 
>>> and look with TBrowser in the tree I get the following error outputs when looking at any variable in the tree
>>> for each entry.
>>> Error in <TBasket::Streamer>: The value of fNbytes is incorrect (-394784763) ; trying to recover by setting it to zero
>>> 
>>> 
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