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"# hist030_TRatioPlot_residual\n",
"\n",
"Creates a histogram filled with random numbers from a gaussian distribution\n",
"and fits it with a standard gaussian function. The result is passed to the `TRatioPlot`\n",
"constructor. Additionally, after calling `TRatioPlot::Draw` the upper and lower y axis\n",
"titles are modified.\n",
"Confidence interval bands are automatically drawn on the bottom (but can be disabled by draw option `nobands`).\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Paul Gessinger \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:12 PM."
]
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"****************************************\n",
"Minimizer is Minuit2 / Migrad\n",
"Chi2 = 22.1778\n",
"NDf = 33\n",
"Edm = 6.53577e-08\n",
"NCalls = 55\n",
"Constant = 158.988 +/- 4.47298 \n",
"Mean = 0.00662197 +/- 0.0225355 \n",
"Sigma = 0.993481 +/- 0.0169678 \t (limited)\n"
]
}
],
"source": [
"gStyle->SetOptStat(0);\n",
"auto c1 = new TCanvas(\"c1\", \"fit residual simple\");\n",
"auto h1 = new TH1D(\"h1\", \"h1\", 50, -5, 5);\n",
"h1->FillRandom(\"gaus\", 2000);\n",
"h1->Fit(\"gaus\", \"0\");\n",
"h1->GetXaxis()->SetTitle(\"x\");\n",
"auto rp1 = new TRatioPlot(h1);\n",
"rp1->Draw();\n",
"rp1->GetLowerRefYaxis()->SetTitle(\"ratio\");\n",
"rp1->GetUpperRefYaxis()->SetTitle(\"entries\");"
]
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"source": [
"Draw all canvases "
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