Dear ROOTers,
I am encountering a problem with TGraphs in the following macro:
void grtest()
{
TGraph *tgVZ=new TGraph();
tgVZ->SetName("tgVZ");
tgVZ->SetPoint(0,1.,1.);
tgVZ->SetPoint(1,2.,4.);
tgVZ->SetPoint(2,3.,9.);
tgVZ->SetPoint(3,4.,16.);
gROOT->GetList()->Add(tgVZ);
gROOT->ls();
}
When I go to draw it, I get a segv, somehow connected to
the histogram associated with the TGraph:
(4.00/08)
root [0] .x grtest.C
TROOT* Rint The ROOT of EVERYTHING
OBJ: TGraph tgVZ : 0 at: 0x8b3af28
root [1] tgVZ->Draw("ap")
<TCanvas::MakeDefCanvas>: created default TCanvas with name c1
Warning in <TH1::Build>: Replacing existing histogram: tgVZ (Potential
memory leak).
*** Break *** segmentation violation
Generating stack trace...
(stack trace below)
...
Root >
root [2]
The graph does draw, and I can then repeat the draw command without
problems.
If I change the name before the first draw command, there is
no problem:
root [0] .x grtest.C
TROOT* Rint The ROOT of EVERYTHING
OBJ: TGraph tgVZ : 0 at: 0x8b3aec8
root [1] tgVZ->SetName("ntgVZ")
root [2] tgVZ->Draw("ap")
Is there something I'm doing wrong with the assignment of the
TGraph to the directory? Many thanks,
Peter Shanahan
0x42029188 in <unknown> from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/bin/root.exe
0x40b6f3eb in TH1::TH1[not-in-charge](char const*, char const*, int,
double, double) at hist/src/TH1.cxx:524 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libHist.so
0x40b87bbd in TH1F::TH1F[in-charge](char const*, char const*, int,
double, double) at hist/src/TH1.cxx:6347 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libHist.so
0x40e3a6ee in TGraph::PaintGraph(int, double const*, double const*, char
const*) at graf/src/TGraph.cxx:2082 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libGraf.so
0x40e3922b in TGraph::Paint(char const*) at graf/src/TGraph.cxx:1818 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libGraf.so
0x4124c498 in TPad::PaintModified() at gpad/src/TPad.cxx:2734 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libGpad.so
0x4122a14c in TCanvas::Update() at gpad/src/TCanvas.cxx:1791 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libGpad.so
0x4020f48d in TCint::UpdateAllCanvases() at meta/src/TCint.cxx:1106 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libCore.so
0x4020c725 in TCint::ProcessLine(char const*, TInterpreter::EErrorCode*)
at meta/src/TCint.cxx:302 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libCore.so
0x4020c8cb in TCint::ProcessLineSynch(char const*,
TInterpreter::EErrorCode*) at meta/src/TCint.cxx:352 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libCore.so
0x4020c24d in TCint::EndOfLineAction() at meta/src/TCint.cxx:185 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libCore.so
0x41794c6c in TRint::HandleTermInput() at rint/src/TRint.cxx:420 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libRint.so
0x417933ab in TTermInputHandler::Notify() at rint/src/TRint.cxx:102 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libRint.so
0x41795a4d in TTermInputHandler::ReadNotify() at rint/src/TRint.cxx:96
from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libRint.so
0x4028bd93 in TUnixSystem::CheckDescriptors() at
unix/src/TUnixSystem.cxx:892 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libCore.so
0x4028b5d1 in TUnixSystem::DispatchOneEvent(bool) at
unix/src/TUnixSystem.cxx:693 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libCore.so
0x401cbdd1 in TSystem::InnerLoop() at base/src/TSystem.cxx:317 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libCore.so
0x401cbd5a in TSystem::Run() at base/src/TSystem.cxx:285 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libCore.so
0x40155331 in TApplication::Run(bool) at base/src/TApplication.cxx:807
from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libCore.so
0x41794561 in TRint::Run(bool) at rint/src/TRint.cxx:263 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/lib/libRint.so
0x08048d4e in main + 0xba from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/bin/root.exe
0x42017589 in __libc_start_main + 0x95 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/bin/root.exe
0x08048bf1 in TApplicationImp::ShowMembers(TMemberInspector&, char*) +
0x31 from
/afs/fnal.gov/files/code/e875/general/ROOT/Linux2.4-GCC_3_3/v4-00-08/bin/root.exe
Root >
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This archive was generated by hypermail 2b29 : Sun Jan 02 2005 - 05:50:10 MET