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"# gr008_multierrors\n",
"for example statistical and systematic errors.\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Simon Spies \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:37 PM."
]
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"TCanvas *c1 = new TCanvas(\"c1\", \"A Simple Graph with multiple y-errors\", 200, 10, 700, 500);\n",
"c1->SetGrid();\n",
"c1->GetFrame()->SetBorderSize(12);\n",
"\n",
"const Int_t np = 5;\n",
"Double_t x[np] = {0, 1, 2, 3, 4};\n",
"Double_t y[np] = {0, 2, 4, 1, 3};\n",
"Double_t exl[np] = {0.3, 0.3, 0.3, 0.3, 0.3}; //Lower x errors\n",
"Double_t exh[np] = {0.3, 0.3, 0.3, 0.3, 0.3}; //Higher x errors\n",
"Double_t eylstat[np] = {1, 0.5, 1, 0.5, 1}; //Lower y statistical errors\n",
"Double_t eyhstat[np] = {0.5, 1, 0.5, 1, 0.5}; //Higher y statistical errors\n",
"Double_t eylsys[np] = {0.5, 0.4, 0.8, 0.3, 1.2}; //Lower y systematic errors\n",
"Double_t eyhsys[np] = {0.6, 0.7, 0.6, 0.4, 0.8}; //Higher y systematic errors\n",
"\n",
"TGraphMultiErrors *gme = new TGraphMultiErrors(\"gme\", \"TGraphMultiErrors Example\", np, x, y, exl, exh, eylstat, eyhstat); //Create the TGraphMultiErrors object\n",
"gme->AddYError(np, eylsys, eyhsys); //Add the systematic y-errors to the graph\n",
"gme->SetMarkerStyle(20);\n",
"gme->SetLineColor(kRed);\n",
"gme->GetAttLine(0)->SetLineColor(kRed); //Color for statistical error bars\n",
"gme->GetAttLine(1)->SetLineColor(kBlue); //Color for systematic error bars\n",
"gme->GetAttFill(1)->SetFillStyle(0);"
]
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"Graph is drawn with the option \"APS\": \"A\" draw axes, \"P\" draw points and \"S\" draw symmetric horizontal error bars (x-errors)\n",
"Statistical y-errors are drawn with the option \"Z\" vertical error bars.\n",
"Systematic y-errors are drawn with the option \"5 s=0.5\":\n",
"\"5\" draw rectangles to represent the systematic y-error bars.\n",
"\"s=0.5\" scale the rectangles horizontally (along the x-axis) by a factor of 0.5."
]
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"gme->Draw(\"APS ; Z ; 5 s=0.5\");\n",
"\n",
"\n",
"c1->Update();"
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"source": [
"Draw all canvases "
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"source": [
"%jsroot on\n",
"gROOT->GetListOfCanvases()->Draw()"
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