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"# hist031_TRatioPlot_residual_fit\n",
"\n",
"Since the lower plot is not created until `TRatioPlot::Draw` is called, you can only use the method\n",
"afterwards.\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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"name": "stdout",
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"text": [
"****************************************\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",
"c1->SetLogy();\n",
"auto h1 = new TH1D(\"h1\", \"h1\", 50, -5, 5);\n",
"h1->FillRandom(\"gaus\", 2000);\n",
"h1->Fit(\"gaus\", \"0\");\n",
"h1->SetMinimum(0.001);\n",
"h1->GetXaxis()->SetTitle(\"x\");\n",
"h1->GetYaxis()->SetTitle(\"y\");\n",
"auto rp1 = new TRatioPlot(h1);\n",
"rp1->Draw();\n",
"rp1->GetLowerRefGraph()->SetMinimum(-2);\n",
"rp1->GetLowerRefGraph()->SetMaximum(2);"
]
},
{
"cell_type": "markdown",
"id": "65356413",
"metadata": {},
"source": [
"Draw all canvases "
]
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"source": [
"gROOT->GetListOfCanvases()->Draw()"
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