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    "# hsimpleProxyDriver\n",
    "This is the driver of the hsimpleProxy example.\n",
    "It provides the infrastructure to run that code on an ntuple\n",
    "To be run from the tutorials directory\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "**Author:** Rene Brun  \n",
    "<i><small>This notebook tutorial was automatically generated with <a href= \"https://github.com/root-project/root/blob/master/documentation/doxygen/converttonotebook.py\">ROOTBOOK-izer</a> from the macro found in the ROOT repository  on Tuesday, May 19, 2026 at 08:16 PM.</small></i>"
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     "iopub.status.busy": "2026-05-19T20:16:58.152152Z",
     "iopub.status.idle": "2026-05-19T20:16:58.518084Z",
     "shell.execute_reply": "2026-05-19T20:16:58.517771Z"
    }
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   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "/github/home/master/notebooks\n"
     ]
    },
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Error in <TTreeFormula::Compile>:  Invalid Syntax \"+\"\n",
      "Info in <TSelectorDraw::AbortProcess>: Variable compilation failed: {input_line_44/hsimpleProxy.C+,}\n"
     ]
    }
   ],
   "source": [
    "std::cout << gSystem->WorkingDirectory() << std::endl;\n",
    "TFile *file = TFile::Open(\"hsimple.root\");\n",
    "if (!file){\n",
    "   std::cerr << \"Input file not found.\\n\";\n",
    "   return ;\n",
    "}\n",
    "TTree *ntuple = nullptr;\n",
    "file->GetObject(\"ntuple\",ntuple);\n",
    "std::string s1(__FILE__);\n",
    "TString dir = gSystem->UnixPathName(s1.substr(0, s1.find_last_of(\"\\\\/\")).c_str());\n",
    "ntuple->Draw(dir+\"/hsimpleProxy.C+\");"
   ]
  }
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