Hi,
I read in the TTree::Draw class doc that objects in leaves can be ‘drawn’ just like
simple variables, if they have an AsDouble() method. The example given is for a TTimeStamp. I tried to implement this for my classes, failed, then checked if the example works, and it doesn’t (for me)…
Can you tell me what I’m doing wrong please ?
I made the tree like this:
TTimeStamp* ts = new TTimeStamp;
TTree* tree = new TTree("EventShape","Event shape global variables");
tree->Branch("time", "TTimeStamp", &ts, 32000, 0);When I read the tree afterwards, I can do
root [2] EventShape->Draw("time.AsDouble()")OK, but if I try
root [3] EventShape->Draw("time") then it’s a catastrophe (and the same happens if I try to draw using the treeviewer):
*** Break *** segmentation violation
(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
Attaching to program: /proc/882/exe, process 882
(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
[New Thread -1208236336 (LWP 882)]
(no debugging symbols found)...done.
0x00ec6402 in __kernel_vsyscall
()
#1 0x00f56c23 in __waitpid_nocancel () from /lib/libc.so.6
#2 0x00efd1db in do_system () from /lib/libc.so.6
#3 0x00e4d19d in system () from /lib/libpthread.so.0
#4 0x00360d5d in TUnixSystem::Exec () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#5 0x00365ac7 in TUnixSystem::StackTrace () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#6 0x0036542e in TUnixSystem::DispatchSignals () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#7 0x0036556d in SigHandler () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#8 0x0035e0e4 in sighandler () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#9 <signal handler called>
#10 0x021169b5 in TFormLeafInfo::TFormLeafInfo$base () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#11 0x02119a87 in TFormLeafInfoDirect::TFormLeafInfoDirect () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#12 0x0212ca85 in TTreeFormula::SwitchToFormLeafInfo () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#13 0x02139eb2 in TTreeFormula::ParseWithLeaf () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#14 0x0213d3dd in TTreeFormula::DefinedVariable () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#15 0x010a5408 in TFormula::Analyze () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libHist.so
#16 0x010b26ea in TFormula::Compile () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libHist.so
#17 0x0212b648 in TTreeFormula::Init () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#18 0x0213b6cc in TTreeFormula::TTreeFormula () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#19 0x02122e02 in TSelectorDraw::CompileVariables () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#20 0x021244de in TSelectorDraw::Begin () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#21 0x02142794 in TTreePlayer::Process () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#22 0x0214809c in TTreePlayer::DrawSelect () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTreePlayer.so
#23 0x0394a50d in TTree::Draw () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTree.so
#24 0x0393ef85 in TTree::Draw () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libTree.so
#25 0x004de448 in G__G__Base2_9_0_15 () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#26 0x008c381a in Cint::G__ExceptionWrapper () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#27 0x009a8550 in G__call_cppfunc () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#28 0x009829dd in G__interpret_func () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#29 0x00971c59 in G__getfunction () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#30 0x00a3d079 in G__getstructmem () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#31 0x00a34b5f in G__getvariable () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#32 0x00947441 in G__getitem () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#33 0x009476c8 in G__getitem () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#34 0x0094e351 in G__getexpr () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#35 0x009d4426 in G__exec_statement () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#36 0x00932bce in G__exec_tempfile_core () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#37 0x00932ed6 in G__exec_tempfile_fp () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#38 0x009dc2d4 in G__process_cmd () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCint.so
#39 0x003390a5 in TCint::ProcessLine () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#40 0x0029f376 in TApplication::ProcessLine () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#41 0x0011c779 in TRint::HandleTermInput () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libRint.so
#42 0x0011ad25 in TTermInputHandler::Notify () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libRint.so
#43 0x0011d094 in TTermInputHandler::ReadNotify () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libRint.so
#44 0x0036464b in TUnixSystem::CheckDescriptors () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#45 0x00364a3e in TUnixSystem::DispatchOneEvent () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#46 0x002f6fb1 in TSystem::InnerLoop () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#47 0x002f8901 in TSystem::Run () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#48 0x0029dd08 in TApplication::Run () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libCore.so
#49 0x0011cccf in TRint::Run () from /home/franklan/.root-v5.17.04_gcc-4.1.2/lib/libRint.so
#50 0x08048d73 in main ()
The program is running. Quit anyway (and detach it)? (y or n) [answered Y; input not from terminal]
Detaching from program: /proc/882/exe, process 882Thanks a lot
John
).