{
"cells": [
{
"cell_type": "markdown",
"id": "02013ec7",
"metadata": {},
"source": [
"# hist032_TRatioPlot_fit_lines\n",
"Example that shows custom dashed lines on the lower plot, specified by a vector of floats.\n",
"\n",
"By default, dashed lines are drawn at certain points. You can either disable them, or specify\n",
"where you want them to appear.\n",
"Inspired by the tutorial of Paul Gessinger.\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Alberto Ferro \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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"execution_count": 1,
"id": "fef71259",
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"shell.execute_reply": "2026-05-19T20:12:44.573489Z"
}
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"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"
]
},
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"\n",
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"metadata": {},
"output_type": "display_data"
}
],
"source": [
"import ROOT\n",
"\n",
"ROOT.gStyle.SetOptStat(0)\n",
"\n",
"c1 = ROOT.TCanvas(\"c1\", \"fit residual simple\")\n",
"h1 = ROOT.TH1D(\"h1\", \"h1\", 50, -5, 5)\n",
"h1.FillRandom(\"gaus\", 2000)\n",
"h1.Fit(\"gaus\")\n",
"h1.GetXaxis().SetTitle(\"x\")\n",
"h1.GetYaxis().SetTitle(\"y\")\n",
"\n",
"rp1 = ROOT.TRatioPlot(h1)\n",
"\n",
"lines = ROOT.std.vector('double')()\n",
"for i in range(-3,4):lines.push_back(i)\n",
"rp1.SetGridlines(lines)\n",
"\n",
"rp1.Draw()\n",
"rp1.GetLowerRefGraph().SetMinimum(-4)\n",
"rp1.GetLowerRefGraph().SetMaximum(4)\n",
"\n",
"c1.Update()"
]
},
{
"cell_type": "markdown",
"id": "8360e0be",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "b77dff38",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:12:44.576105Z",
"iopub.status.busy": "2026-05-19T20:12:44.575973Z",
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"outputs": [
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"data": {
"text/html": [
"\n",
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"\n",
"\n"
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""
]
},
"metadata": {},
"output_type": "display_data"
}
],
"source": [
"from ROOT import gROOT \n",
"gROOT.GetListOfCanvases().Draw()"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
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"name": "ipython",
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"file_extension": ".py",
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