{
"cells": [
{
"cell_type": "markdown",
"id": "c8348801",
"metadata": {},
"source": [
"# hist034_TRatioPlot_fit_margin\n",
"Example showing a fit residual plot, where the separation margin has been set to 0.\n",
"The last label of the lower plot's y axis is hidden automatically.\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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"id": "88c64c53",
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"shell.execute_reply": "2026-05-19T20:12:48.988798Z"
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},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"****************************************\n",
"Minimizer is Minuit2 / Migrad\n",
"Chi2 = 29.7219\n",
"NDf = 34\n",
"Edm = 7.65715e-08\n",
"NCalls = 55\n",
"Constant = 395.847 +/- 6.87936 \n",
"Mean = 0.00695631 +/- 0.0142942 \n",
"Sigma = 1.00274 +/- 0.0101683 \t (limited)\n"
]
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"metadata": {},
"output_type": "display_data"
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],
"source": [
"import ROOT\n",
"\n",
"ROOT.gStyle.SetOptStat(0)\n",
"\n",
"c1 = ROOT.TCanvas(\"c1\", \"fit residual simple\")\n",
"ROOT.gPad.SetFrameFillStyle(0)\n",
"\n",
"h1 = ROOT.TH1D(\"h1\", \"h1\", 50, -5, 5)\n",
"h1.FillRandom(\"gaus\", 5000)\n",
"h1.Fit(\"gaus\", \"S\")\n",
"\n",
"h1.Sumw2()\n",
"h1.GetXaxis().SetTitle(\"x\")\n",
"h1.GetYaxis().SetTitle(\"y\")\n",
"\n",
"rp1 = ROOT.TRatioPlot(h1, \"errfunc\")\n",
"rp1.SetGraphDrawOpt(\"L\")\n",
"rp1.SetSeparationMargin(0.0)\n",
"rp1.Draw()\n",
"rp1.GetLowerRefGraph().SetMinimum(-2)\n",
"rp1.GetLowerRefGraph().SetMaximum(2)\n",
"\n",
"c1.Update()"
]
},
{
"cell_type": "markdown",
"id": "09291761",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "32b12611",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:12:48.991260Z",
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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",
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