Not in tutorials, although what I was basing the code on was this:
I have two files, ROC.root and SherpaRoc.root. They each contain Multiple TGraphs which show up in a TBrowser as Graph;1, Graph;2 … Graph;10. So I need to get Graph;10 from each file and plot them on the same graph (with different coloured lines). I’m not sure how to get Graph;10 rather than Graph;1, say, but then I can’t get it working at all yet.
I changed it back to “read” for the two existing files and get some weird output like this:
Processing combineROCCurves.C...
gdb.printing.register_pretty_printer(gdb.current_objfile(),
gdb.printing.register_pretty_printer(gdb.current_objfile(),
#0 0x00007f4b7708e41c in waitpid () from /lib64/libc.so.6
#1 0x00007f4b7700bf12 in do_system () from /lib64/libc.so.6
#2 0x00007f4b77bfe644 in TUnixSystem::StackTrace() () from /usr/lib64/root/libCore.so.6.18
#3 0x00007f4b71fb8d95 in cling::MultiplexInterpreterCallbacks::PrintStackTrace() () from /usr/lib64/root/libCling.so
#4 0x00007f4b71fb823b in cling_runtime_internal_throwIfInvalidPointer () from /usr/lib64/root/libCling.so
#5 0x00007f4b7835819e in ?? ()
#6 0x00007fffb560b5d0 in ?? ()
#7 0x00007fffb560b5cf in ?? ()
#8 0x00007fffb560b5e0 in ?? ()
#9 0x0000000c00000000 in ?? ()
#10 0x0000000001bae8e0 in ?? ()
#11 0x0000000001b8f640 in ?? ()
#12 0x00000000019819a8 in ?? ()
#13 0x0000000001980ff8 in ?? ()
#14 0x0000000001a67cc0 in ?? ()
#15 0x0000000001981008 in ?? ()
#16 0x0000000001bae850 in ?? ()
#17 0x00007fffb560b830 in ?? ()
#18 0x0000000000000000 in ?? ()
Error in <HandleInterpreterException>: Trying to dereference null pointer or trying to call routine taking non-null arguments.
Execution of your code was aborted.
In file included from input_line_8:1:
**/home/atlas/krybacki/Pythia/Test/combineROCCurves.C:43:1:** **warning:** **null passed to a callee that requires a non-null argument [-Wnonnull]**
graph->Draw();
which I’m guessing is it complaining that ‘graph’ doesn’t exist or something?