Hi Colin,
The problem you see with TTree::Draw is solely a consequence of the problem
you see in the MakeClass object. Once you create the MakeClass object, it
sets up the address of the TTree. Once you reopen the file, those address
are not set anymore and TTree::Draw sets its own and has no problem.
So anyway, the only problem you have is that the MakeClass somehow does not
properly set the addresses.
Cheers,
Philippe
-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Colin Bernet
Sent: Wednesday, September 18, 2002 10:27 AM
To: roottalk@pcroot.cern.ch
Subject: [ROOT] bug in Tree::Draw() ???
Hello rooters !
Sorry to bug you again with my tree... I'm now one step further (thanks to
Rene and Davide), and I noticed something peculiar : When I use a tree
inside a MakeClass generated code, using functions like sin or sqrt in
Tree::Draw doesn't seem to be possible anymore.
Here is what I did :
root [7] TFile
f("/home/data2002/minidst/DstOut20230/chunk10001/MDST_0.root")
root [8] TTree *tree=(TTree*)f.Get("MDST")
root [9] tree->MakeClass("TestMC")
Info in <TTreePlayer::MakeClass>: Files: TestMC.h and TestMC.C generated
from Tr
ee: MDST
(Int_t)0
root [10] .L TestMC.C
root [11] TestMC tmc(tree)
root [13] tmc.fChain ->Draw("sqrt(number)")
*** Break *** segmentation violation
Root >
root [14]
root [14] tree->Draw("sqrt(number)")
*** Break *** segmentation violation
Root >
root [15]
root [15] TFile
f("/home/data2002/minidst/DstOut20230/chunk10001/MDST_0.root")
root [16] TTree *tree=(TTree*)f.Get("MDST")
root [17] tree->Draw("sqrt(number)")
now ok.
Strange, isn't it ?
I'm usually using the MakeClass generated codes to implement a more
convenient way of chaining the files :
MyClass::MyClass(const char* pattern)
will chain together all files matching pattern.
Therefore I often use MyClass only to chain the files automatically and
then use
MyClass::fChain directly. This is why I would need to have all
functionnalities of Tree::Draw working also in this case.
Do you know what is happening ?
Many thanks,
Colin
ROOT 3.03/08 for gcc 2.95.2 on RH 6.2
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