{
"cells": [
{
"cell_type": "markdown",
"id": "56952440",
"metadata": {},
"source": [
"# gr014_polar3\n",
"See the [TGraphPolar documentation](https://root.cern/doc/master/classTGraphPolar.html)\n",
"\n",
"Since TGraphPolar is a TGraphErrors, it is painted with\n",
"[TGraphPainter](https://root.cern/doc/master/classTGraphPainter.html) options.\n",
"\n",
"\n",
"\n",
"**Author:** Olivier Couet, Jamie Gooding \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:38 PM."
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "4f6246b1",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:03.246501Z",
"iopub.status.busy": "2026-05-19T20:38:03.246376Z",
"iopub.status.idle": "2026-05-19T20:38:04.452941Z",
"shell.execute_reply": "2026-05-19T20:38:04.447393Z"
}
},
"outputs": [],
"source": [
"import math\n",
"\n",
"import numpy as np\n",
"import ROOT\n",
"\n",
"CPol = ROOT.TCanvas(\"CPol\", \"TGraphPolar Examples\", 500, 500)\n",
"\n",
"rmin = 0\n",
"rmax = math.pi * 2\n",
"r = np.array([])\n",
"theta = np.array([])\n",
"\n",
"fp1 = ROOT.TF1(\"fplot\", \"cos(x)\", rmin, rmax)\n",
"for ipt in range(1000):\n",
" r = np.append(r, ipt * (rmax - rmin) / 1000 + rmin)\n",
" theta = np.append(theta, fp1.Eval(r[ipt]))\n",
"\n",
"grP1 = ROOT.TGraphPolar(1000, r, theta)\n",
"grP1.SetTitle(\"\")\n",
"grP1.SetLineColor(2)\n",
"grP1.Draw(\"AOL\")"
]
},
{
"cell_type": "markdown",
"id": "28a35aa7",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "2609e020",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:04.454724Z",
"iopub.status.busy": "2026-05-19T20:38:04.454526Z",
"iopub.status.idle": "2026-05-19T20:38:04.638041Z",
"shell.execute_reply": "2026-05-19T20:38:04.637699Z"
}
},
"outputs": [
{
"data": {
"text/html": [
"\n",
"\n",
"\n",
"
\n",
"\n",
"\n",
"\n"
],
"text/plain": [
""
]
},
"metadata": {},
"output_type": "display_data"
}
],
"source": [
"from ROOT import gROOT \n",
"gROOT.GetListOfCanvases().Draw()"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
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